Well, if you have some extra money. I'd always go with an enermax. That's what I've always used, and a 350 watt performs at 430 watts. a 300 is about 370. They are high quality too and won't burn out on you. I had one powersupply go on me, some cheap crap, I thought I had died because a capacitor blew... Sounded like a shotgun going off a few inches from my head. Since then i've been scared straight. Only enermax for me.