oem power supplies look fishy and come from brands ive never even heard of, like the computer im posting this from has a Bestec power supply, and ive never heard of them. I also just dont trust the capacitors in one of those will last as long as something like a EVGA power supply, hell even an Antec power supply if you need to go cheaper.
Ok, that's pretty reasonable.
Akio, have you had any problems with the power supply so far? If not, you could probably hold out with the one you have (if it is the 500 watt).
Also, Akio, what's yo' budget?