Sorry for the double-post, but I forgot to add that the 8800GT is the 512mb version, now 256.
I'm not sure that my Motherboard will support an x3 CPU, I will need to check this.
Also if we're talking about a complete PC revamp, then I'd just go with buying a completely new PC with a new m/b, ram, video, cpu etc
The 5200+ isnt a bad CPU as far as I know and in games CPU isnt that important, or is it? Are you sure it will bottleneck the 2x8800GTs?