why are we arguing about this? we are talking game play not desktop graphics. the amount of vram that is beneficial is pretty well established. (a 4870 512 and 1gb perform very similar that this res) we have seen a recent upswing in memory mattering but we are splitting hairs here.
OP, the gen consensus seems to be that a 6850 or a 460GTX would be fine for that. both provide similar game play and are pretty inexpensive. if you wanted to spend a little more then a 6870 or a high end OCed 460 would be nice (I would opt for the 6870 out of that but its a personal preference). both come with 1gb of memory that is more then needed at your res. (H reviews don't show 1gb memory mattering really until 4mp)
OP, the gen consensus seems to be that a 6850 or a 460GTX would be fine for that. both provide similar game play and are pretty inexpensive. if you wanted to spend a little more then a 6870 or a high end OCed 460 would be nice (I would opt for the 6870 out of that but its a personal preference). both come with 1gb of memory that is more then needed at your res. (H reviews don't show 1gb memory mattering really until 4mp)