Title says it all

gtx780ti

780 TI, No competition

780Ti hands down. You'll yourself without enough power to run your games with the 770 before you ran into problems because of lack of memory with the 780Ti.

Alternatively, you could go with a Titan Black and have more power than a 780Ti and also 6GB... or wait until Maxwell comes to see how fast and how much memory they have.

GTX 750Ti and 300-600 bucks in your pocket for a VIP trip to the finest local strip club.

780Ti is easily one of the fastest cards money can buy.

A complete and utter waste if you're only gaming at 1080P.

770 is incredibly potent.

Basically price should be the key factor here, if you want performance, the 780 is hard to beat, if you want to save some bucks, the 770 is an alternative.

Take a 760Ti instead of either. Awesome bang for buck IMO.

Between these two, the 770. Though, honestly, I am not a huge fan of expensive cards at all, so my choice is only natural.

780ti is a waste of money.

WHat game would it make a difference on? None. Why? Because cards are far ahead of games at the moment. Get a 770, then when you need the power of a 780ti in 2 years, but the gtx 870/970 with the money you saved.

Depending on your situation a GPU right now may not be the best investment. Both of those cards will not be able to keep up with the consoles in a couple of years, and major improvements are coming in the next two years.

If you had to go with one of those I would get the 770 just to save $300. Then in 2 to 3 years pick up a 970 or 1070 for $300 - $400.

That way you could play most things today at 1080p/60 max, and when then move up to 4K/60 max once more games are available, and tvs have dropped.

gtx 690