Two examples:

nVidia 256MB XFX 6800XT (350/1000)
ATI 512MB Sapphire Radeon X1600Pro (500/800)

I've not used ATI in a long time, so someone else will need to comment on the good/bad points on that card, but the nVidia card seems like it's a decent price for a card similar-ish to my own (256MB 6800GT), which will run the likes of Battlefield 2, Half Life 2, etc, without any problems...