I prefer Corsair after reading many PS reviews. Personnally, I prefer to go a bit bigger than you need simply because the PS's are are much more efficient when they are putting out closer to half of their rated power. You could go with a TX or CX 600 watt version even though a 500 watt would probably work fine. But all things being equal a smaller supply will run hotter and use more power to make the output wattage than a bigger version. It may seem counter intuitive, but if you read enough reviews you will see it is true. A Very high quality 1200 watt PS will consume less power at the wall putting out 500 watts than a mediocre 600 watt PS putting out the same 500 watts. I recently got a Corsair AX750 Gold which has a fan that is supposed to turn on when it starts getting hot and it rarely turns on. My older PS was a Thermaltake 600 watt, which worked fine, but it ran very hot all the time. I consider the PS too important to buy the cheapest that will work.