heya asg102;
In my oppinion the 2.8c is the best bang for the buck, pair it with the Abit Is7-G, and some Samsung modules, and you will get excellent results. Some may disagree, favoring the latest technology, however just because it is newer doesnt make it better, if you are even considering the prescott, i would wait just a little longer and get the new LGA775 P4 instead, take advantage of the DDR2 and PCIe that will be available. Being that this may completely make obsolete some of your hardware, and push you to buy new hardware to replace it, you should take that into consideration before making the decision to upgrade to the latest and greatest.
In anycase skip the prescott its a waste of time.
<Archer> Cant this thing go any faster, I thought this was a warp 5 Engine?
<Trip> Yeah, on paper...
Xeen