What is your system rig? Because if it includes a AMD 15xx Mhz or more 512+ MB Ram, a RAID array, GF 3-4/Readon 8500, and a lot case fans, you might wanna consider, that the PSU is powerfulle enough, or else you will experince alot instabillity.
I'd recommend the German Noice Control - they build som very nice PSU, with Papst fans, their are almost silent (15-25 db, depending on model and effekt) but the other brands suggested are also worth buying =)
But - beware of how much your entire system consumes.
Real men don't do backup...
...real men cry ALOT!
Linux RoxX