HOLD IT! DO NOT GET THE PRESCOTT! IT RUNS HOT AND PERFORMS ONLY A HAIR BETTER THAN THE NORTHWOOD!
I think you should go AMD...They are faster and cheaper, and overclock much better. The new P4's are nice, but if you REALLY want power, fuck that single CPU shit, get a dual Opteron, Athlon MP, or Xeon setup. The HyperThreading technology is a load of bullshit, it still sucks compared to a dual processor setup. Hell, even a 3,2GHz Prescott would lose to the fastest dual Athlon MP system...dual CPU's are the way to go...if you can afford them. Tom's Hardware had an article on dual CPU Xeons, you should check that out.