Hmm, I have a simmilar problem, but i have 1.3 Athlon, 1GB of ram, and a Nvidia 5200FX. I bought more ram, (had 512) and the 5200, but my biggest problem is the fawking A socket CPU. I am NOT willing to spend the amount the best socket A example costs, (more than a decent AMD 64 X2) I also have a nForce 2 chip, but it's in mini-ATX format, which limits the gig of ram I bought down to 333MHz from 400... bummer, right?

so I'm just going to get a whole new block w/o the HD and CD-rom. It's going to be a good 800 USD, but, while that seems steep, I think it's quite a good investment.

EDIT: but, if I had a 2.0CPU, I would just get a 6800GT or an ATI equivalent, since the CPU is the biggest bottleneck atm.