Caviar Blue is a slow drive. Samsung F3 500GB or Seagate 7200.12 for $55 would be much faster for booting and program loading.
I chose to go with the AthlonIIx3 2.9GHz. I have had it overclocked as high as 3.6GHz and can unlock the 4th core, but not with that fast of an OC. The third core seems to help alot if you look at the article Toms did about #of cores and gaming machines. A fourth core doesnt help much in most games.