Upgrade advise pls

reason for upgrade -> sometimes red fps when running everything on max on cod4,5 ;o
p5k
4gb dominator ddr2 1066
e8400
9800gtx+
22" (1680x1050)
Prelude 7.1
corsair 750tx psu
vista 32
hard disk doesnt really matter
gaming rig
im looking forward to get evga stuff coz they looks like pretty sweet some advises pls ;o
i like to run single display cards (nvidia cards pls)

gtx295? but as far as i know new dx will be launching so is it worth buying them? or it doesnt matter coz until now there's not much games using dx10 engine? so probably will be the same for the new one?
thx