If you are thinking of dropping $ on 2 7970s, wouldn't it make sense to see where the Titan lands and how well it overclocks? Also, some after-market HD7950s like Sapphire Dual-X or Vapor-X can overclock to 1100mhz at which point HD7950 is trading blows with GTX680/HD7970GE.  HD7950s OCx2 would save you $160+ over 2 7970s and would come in at $330 less than the Titan's rumored price of $899. ($280 x 2 = $560)

At 1200mhz, HD7950 blows right past GTX680/HD7970GE with ease.

http://www.techpowerup.com/reviews/HIS/HD_7950_X2_Boost/31.html

A lot of people forget that HD7950 is just a slightly cut-down factory underclocked HD7970. You still get the full 384-bit bus, same 32 ROPs, only a bit less shaders and TMUs. The card performs within 5% of HD7970 when both are at the same clock speeds:

http://hexus.net/tech/reviews/graphics/34761-amd-hd-7950-vs-hd-7970-clocks/?page=10

The HD7950 is one of the most underrated cards this generation. Probably because originally after-market versions were selling for $450-500 when GTX670 launched at $400. For $280-290, HD7950 is seriously an impressive amount of value in the hands of overclockers.

http://www.legionhardware.com/articles_pages/his_7970_iceq_xsup2_ghz_edition_7950_iceq_xsup2_boost_clock,13.html

And if electricity costs are reasonable for you, you can make $80-90+ a month bitcoin mining on the side with AMD cards, which means they pay for themselves over time. 

http://www.bitcoincharts.com/

So far my 7970 OCx2 have made me $900 and I only bought them last summer. If this perk persists, next round I am getting Haswell with 4 PCIe Lanes and 4x HD8970s or 2x HD8990s. 

If you are not an overclocker though, then sure it makes sense to consider 7970s or the Titan :)

^  I cannot get bit mining to work.  I have followed a few guides, but do you have any simple steps  I could follow?

I know the 7950 is a good card as well. I've found a pretty good deal on some new MSI R7970 Lightning cards though. It's not the newer one that was introduced in October, but it is already clocked at 1070/5600 from the factory. It also has the nice Twin Frozer IV cooler. The price difference isn't actually that much off of a generic 7950.

My gtx 580 cards are good for games, but terrible for Bitcoin mining(just like all Nvidia cards), which is another reason I'm switching back to AMD. The money from the 580's will already put a nice dent into the cost of the 7970's, so it won't actually cost me too much to upgrade. If I only got 1 card then it wouldn't cost me anything.

1. You MUST download AMD's SDK Stream. This is what allows the GPU to run GPGPU tasks like bitcoin mining. Download Version 2.8, depending on your OS, 32 or 64-bit.

http://developer.amd.com/tools/heterogeneous-computing/amd-accelerated-parallel-processing-app-sdk/downloads/

2. Go here and make an account.

https://mtred.com

This is basically a Mining pool where PCs work together to mine bitcoins. Don't worry about the Payee Address for now. There are other good ones like:

http://www.btcguild.com/

or

http://www.deepbit.com/

I have accounts at 4 mining pools in case some goes down and I switch servers to another one so my GPU is rarely down.

3. Download this digital Wallet to your desktop.

http://electrum.org/

4. Download this mining Client to actually do the work, called GUIMiner. There are other options but I find this one easy to use. It has 1 major downside, greater CPU usage than others. There are flash ones like www.bitminter.com, or Diablo Miner, etc. 

https://bitcointalk.org/?topic=3878.0

Now what you have to do is Launch GUIMiner and select Server: MtREd (since this is your mining pool, or BTCGuild or Deepbit depending which you registered). Enter your username and password based on the Worker Username on those websites. Press Start mining.

For your videocard, put this flag in the GPU miner box: -w 256 -f15 (you don't have to this right away but ill explain later what it does).

All you have to do now is link your Wallet (point #3) and your MtRed account (point #2). Your wallet is like your bank account. MtRed is like your employer that pays you money. Therefore, the Payee address in MtRed you enter allows you to payout bitcoins you earn in the pool to your wallet (bank account).

In the beginning you can keep your coins in MtRed. You don't have to send them to your wallet until you decide to cash them out.

The question is, who is going to buy a $899 Nvidia card if all the new games are soon going to be optimized for AMD cards. Both the PS4 and the new Xbox are using AMD HD7xxx Gpu's, so all big muti-platform games are going to be developed for that architecture. AMD already announced that they're not going to release a new architecture or any major new cards this year, and are simply rebranding HD7xxx cards to HD8xxx for OEM pc's.

The sticker was applied to everything but it was all new - most of the GPU's had been removed from their boxes and put on top of them for display purposes - I did ask about the used sticker and thats basically the answer i got,  they basically stuck used stickers on them so they could drop the prices to silly levels.

CGI-Quality,

You might want to put your 690 up for sale. I think it might be worth it to side-grade to the Titan as it's rumored to come in within a couple percentages of GTX690's performance, minus the SLI dependency. Launch is slated for February 18th.

http://videocardz.com/39536/nvidia-geforce-gtx-titan-to-be-released-on-february-18th

NV is about to carve out the largest performance gap between its flagship and AMD's since HD2900XT/3870 got smoked by 50% faster 8800GTX. Mighty impressive indeed. Wish the price tag was lower though and this card put up some nice numbers in bitcoin mining. Would have been a day 1 purchase for a pair.

They won't be optimised only for AMD cards.

The XBox 360 was the main lead platform for allot of multiplatform games, which uses an AMD/ATI based GPU.
The fact of the matter is, in the PC space nVidia has better developer relationships with allot of incentives, so developers usually target nVidia hardware.

The other part of this is that nVidia and AMD spend allot of time and money developing their drivers and one of those side effects is specific optimisations for games, nVidia has historically had a small advantage here where it will release drivers just before a big games release whilst AMD can take weeks/months after a games release.
That seems to be slowly changing though, AMD is re-writing allot of the memory management code in it's drivers and is aggressively updating drivers before a major games release which I'm incredibly thankfull for. :)

PC graphics though is incredibly competitive, don't expect one company to be pushed out any time soon and just buy the best price/performance to meet your needs and ignore the branding.

GTX4xx, 5xx and 6xx have EXCELLENT SLI scaling, i'll wait for tomshardware or similar to test the 7xx in sli before i make final choice.

The real issue is that AMD has run out of cash to keep up with Nvidia. Semiaccurate reported that an entire internal team defected to Apple late last year. Makes sense because Apple designed their own custom CPU so graphics is the last thing they depend on external design for, and Apple hate relying on single outside suppliers.