2gb cards dont really give you much, if any performance boost for most games except like GTA. For your price I'd rather pick up a 5870, which'll outperform the 285 and come really really close to the 295.
**If you can afford it, i recomend buying the 285. That is high end gaming**
you dont know what you are talking about. 5850 is better then gtx285 and has dx11 suport and cost less. 5870 on the other hand is significantly faster then gtx285
5970 is king of the hill atm and beat everything apart
dont buy nvidia now they are just not competitive...