I have a a antique system to some of you

Athlon Xp 2500 oced to 2 ghz
1 gig 2700 DDR
80 Gig 7200 WD Sata
GeForce 5600

I was going to build a new system this summer, but decided I don't really need to yet. As this rig is doing all I need it to except for video. I don't need a high performance rig where I can see the sun refelecting off a drop of dew on a blade of grass as I'm playing games. Currently I mostly play BF 2142. Of course on low settings, chugging along with low FPS, but its playable. So I started look at a new video card. And it seems most people recommend a Geforce 7600GS 512M for a AGP system. Found them going for $130ish on newegg and I think I can manage that. And I plan on adding another stick 512 of ram. My question is it even worth it? Would my cpu bottleneck the card? And would the 7600GS be my best option without going above $130?