I've been running a PC Power&Cooling Silencer 275 for ~3 years, mostly 24/7/365. I've been quite happy with it, and it is a very quiet PS. 275 Watts is considered a bit wimpy nowadays, but the Silencer 400 model is muy espensivo.
I bought a Turbo Cool 300 ATX from PC P&C a week ago. When running an OC'd rig, I like knowing that the PS and mainboard are rock steady. Makes troubleshooting a LOT easier!
Many folks are enthused about Enermax PS's. They are said to be quiet. I've read that their DC voltage regulation isn't as good as PC Power&Cooling's. I seriously doubt that they come with 2 year, much less 3 year warrantees!