ok back to your corners
1) the 5670 is not a total fail for gaming. It's a solid entry level card, and is not a real upgrade from the 9600GT but it does need less power.
2) at higher resolutions, both the 4850 and GTS 250 can take some advantage from 1GB of RAM compared to their 512mb versions. Obviously not like the 4870/260.
Right, But for less money, IF you have a semi decent PSu, Why not use a 48501gb/GTS 2501gb?
I mean It preforms like a soild entry card, but it's priced at 100$.