NewEgg Top Sellers for Video Cards
Excluding anything over $130 and ranked by performance (which seems to closely follow price):
ATI Radeon X1950GT 256MB $130
ATI Radeon X1900GT 256MB $120
nVidia GeForce 7600GT 256MB $120
nVidia GeForce 7600GS 512MB $110
nVidia GeForce 7600GS 256MB $85
nVidia GeForce 6600GT 128MB $73
First, know that video card model numbers can be bewildering. It can be impossible to tell from a model number how fast the GPU runs. Tom's Hardware has great video card reviews and has a continually updated video card comparison tool, but they often leave out the most popular cards, generally leave out 512MB which is very useful for EverQuest II, or mention GPU speeds that don't sync up with anything written on the boxes.
Tom's Hardware The Best Video Cards for the Money May 2007 edition
Note that video cards vary from DDR2 to DDR3 memory. GS is a slower CPU than GT so a 7300GT might outrun a 7600GS.