I wouldn't go with a 3.2 CPU.
I just put a new system together and when looking over the prices on CPU's the 3.0 was about $20 more than a 2.8, but a 3.2 was about $100 more than a 3.0. so for now I draw the 'not enough bang for the buck' line between the 3.0 and the 3.2 (but I did get a MB that will allow me to upgrade to 3.8 when the CPU prices are a bit more reasonable in that range.
for video cards I just got a ati radeon X700 pro w/256m for $220. but it was pci-express so that won't likely help you much if your MB is set up for agp.