I just picked up a dual fan 350w rebadged A1 electoronics PSU, and it has held up solid under 100% CPU usage (folding @home distributed computing) for the last couple days. It's pretty quiet too. Have a 300w in 1600+XP system, and it's solid on the 3.3v and 5v rails under load too (running same distributed computing client)
Other people are gonna say Enermax or Sparkle. But check out some of the Mid-major type PSU's, like HEC, Enhance and A1. Seem like good quality and not as big of a hit on your wallet.
Can't comment too much on the HD's though. I have a 60gb WD and it's quiet enough. I have the case off and I can't hear it when it's accessing data.