People Always seem to say, "Good PSU or Bad PSU" and just base it on the brand name. The fact is there are some PSU's from more popular companies that simply suck. And there are some PSU's from no name or less popular companies that are solid as a rock.
You've gotta look at efficiency and stability of the rails. Then you look at the overall MAX output or wattage. Finally you determine what features a PSU has that will satisfy your PC's needs.
EXAMPLE: 20pin, 24 pin, P4, P8, PCI Express, SATA, Active Fault Correction, Passive Fault Correction, Cooling... etc...
I've got a PCP&C Turbo Cool 425w that was actually made for a Dell PC. But since I rebuilt i've been using it ever since... Over 2 years now. I've got more stuff crammed into my TT Shark case then I could ever imagine a PSU of this size could handle... Never had a random restart and rails are solid. It is a little bit loud and gives off a lot of heat, but that's due to the 70% efficiency... It might even be lower.
Tomshardware did a serious 24 Hour PSU Stress test on like 15 PSU's. Two of the ones that came out on top were pretty much no name, unpopular companies... (Seasonic & Fortron) they actually outperformed PCP&C, Antec and OCZ...
lol - i know "nubius" hates Tomshardware... But it's a good read anyway...
http://www6.tomshardware.com/howto/200507111/