For heatsinks, Zalman or Thermalright are arguably the best, though I still like Thermaltake.
PSUÂ’s, you say best, not best value, therefore, Vantec, Antec, Thermaltake, Aerocool and Enermax are all very good, I favour the Aerocool.
Harddrives, the jury is still out on this one, but I would suggest its between Seagate and Western Digital.
Soundcards, the Creative Labs Soundblaster series has the market sewn up.
The brand of most other bits is not as important.