For heatsinks, Zalman or Thermalright are arguably the best, though I still like Thermaltake.
PSUs, 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.
Originally Posted by FreeWill
Aquarius 2.... performs as well as urinating in your heatsink