Right now, I'm using an HP desktop (model a6223w). Also, I've previously installed an Antec Earthwatts 380W PSU. I've poked around Power Supply calculators a bit, and I think i'd be fine, but I'd just want to double check.I've nothing else installed on my PC besides what came in it (and the newer PSU).
I always like to say the Thermaltakes are awsome buys, since I've have TT's. CoolerMaster's, Antec's, OCZ's and Thermaltake's are my world, but there are a lot of other good brands that I don't know of and some people do.