or if you want to go the amd way,
hdd from the post above me.
just a lil "edumacation" on processors, on intels p4, the ghz was high, but barley got any work done, while amd had lower ghz, and got the same if not more work done. now, the core 2 duo surpasses the amd line processors. eg: a 3.4ghz p4 would get the same work done as a 2.2ghz amd 3400+. notice that amd uses 3400 to compare itself to a 3.4 ghz p4? so basically:
best p4 ever < oced amd fx64 < C2D
and this is coming from an amd guy, so...yea