One of the worst. They will take other hardware along when they die. The PC P&C 1kW is very much overkill... you could power at least 5 such systems from it. I haven't recommended it for a single computer yet - there just isn't anything out there outside the server realm that requires it.
My suggestion:
http://www.directron.com/atx350pa.html
There are a lot of other very good models from the likes of Fortron, Sparkle, OCZ, Tagan, Enhance, Silverstone, Seasonic, Antec, and Enermax to name a few. All of them will hold up better over time than a Powmax. Just be sure the new PSU is capable of at least 18A on the 12v rail(s) and you should be ok.