From some old Xbit Labs reviews I got power consumption figures for 7900GTX.
I'm not a heavy gamer, but would like an upgrade card for DirectX 10/10.1 (if nVidia start to support it). As I'm not a heavy gamer (apart from MMO's when I decide which to go for) I don't want a top of the range card burning away for just borwsing the web.
When I last looked, the 3870 series looked good, but using Tom's Hardware compare chart it was worse for certain games, e.g. Warhammer: Mark of Chaos (no longer listed).
Have things improved? Or likely to improve with 40nm release?