Card for 720p Projector?

So, I'm planning on building up a projector this summer, and it'll run 1024x768. My only question is, what card should I use to game at that res. Right now I use an HD 4670 to run 1440x900, and it works ok, but something I would very much like to do is run Crysis at high, with 2xAA (maybe the higher, tweaked settings for XP ) at 35+ FPS.

I didn't find any reviews of Crysis running at such a low resolution, though. I calculated it out, and 720p has WAYYY fewer pixels than 1440x900, so that should really improve performance. What do you guys think, will an HD 4670 max out Crysis alright at 1024x768, or should I grab an HD 4770 (or HD 4850), maybe a 9800GTX+ (though, I've never used Nvidia, but Crysis is something I really want to do with this.)

Anyone have any sites that did Crysis @ 1024x768, or just any opinions on what card I should look into (I won't buy until I test Crysis at the low res. though).

Yeah get the 4850 or gts 250 just in case. Crysis is still requires fairly high requirements and with everything at very high and the anti-aliasing required at that low resolution to get rid of jaggies it will be hard to run it at 35+ fps with a 4670 especially in the snow levels.