im assuming you mean a PCIe video card btw, well at just th e $200 mark the new x1950pros are a steal. and under that the 7600GT's (around $140-$150) are a good deal, not much in between thats really worth it tho.
The 7900GTO is 'nice' deal if you find it for cheaper than the X1900XT, the latter one will outperformed by alot nonetheless.
The 7950GT is just overpriced marketing crap, twice the amount of memory and slight increase in memory speed and there goes my $275... The X1950Pro is actually on par with it.