Well my budget is $200 (£100) and can't afford a brand new 6600gt but my budget isn't fixed if I wait a few weeks.
I don't mind second hand and want a kick ass card that handle all brand new games at full settings. Plus I'm using the GeFroce FX5200 at the mo and had no probs with it.
I don't know the deal with RAM I just assumed more was better.