If you want something that is not shooter you could try Shogun 2

DA2 is ugly even with high res textures.

You asked for demanding games, not pretty ones

So a while back I posted http://gamrconnect.vgchartz.com/thread.php?id=128482this thread about a budget PC I had built. That's still my PC, except my power supply is now 750 watts and my graphics card is the nVidia GeForce GTX 580 (currently the highest performing single GPU on the market, though you could get better performance with SLI of two of them or two weaker but still very powerful cards). You're probably wondering how I ended up with a $450 graphics card on a budget build, and it's because we are currently working with nVidia to provide people with reviews on 3D Vision games and information on the 3D in games, thus the need for a top of the line 3D capable graphics card, which our partners at nVidia sent out to me. 

So basically, I'm tyring to get a handle on what it's capable of. I've already run The Witcher 2 in 1080p maxed out (including ubersampling) in the mid 20fps range, above 30 without ubersampling, but I'd like some other games to benchmark. So please give me some helpful suggestions so I can get a good idea of what my PC's updated capabilities are. Games that make good use of 3D are, of course, appreciated, as that's something I'm testing out as well.