Sooner or later the 300W won't cut it or flat out fail and maybe take a device in the process. With all the goodies you got you ned room to grow on and work with. I suggest a 350W or hi-quality p/s unit but cheaper 400W+ are easily gottern and for even a few $ more a 450-500W+ isn't being outrageous. If you want to see what can be suggested look at this website:
http://www.pcpowerandcooling.com

Even though you pay more, you get one hella of alot quality and *stable output* far better than anything out there. Brand names like Antec, Enermax or Vantec should be look at in the 400W+ range.

Real cool system cases don'tr even come with p/s units expecting you to decide on the best desirable unit. Happy

Feliz Nuevo Ano Grin -----Willy