dude the 5770 will play any game out there dont worry, the prices WILL drop considerably when fermi comes out, its been happening every year since the nvidia/ati war started, if you want to sell more you drop the prices, common sense.
go for the 5770 definatley, small fast and cool, also more expandablity i.e xfire.
budget cards are hugely underestimate these days, i mean im still using a 4670 and i play Mass effect 2 all the fancy settings up 1440x900 just fine.