My sister needs help speccing a PC and I was just wondering what opinions are like on Coolermaster power supplies. We need to decide between the CM GX 550 (here) and the Corsair CX 500 (here) (I know Corsair PSUs are regarded highly and I have one myself). Other parts she is likely to have include a GTX560, i5 2500, 8GB 1333 DDR3 RAM, Gigabyte P67 UD3, Fractal Design R3, and Samsung F3 1TB. Any thoughts on that too? She is not going to overclock and is extremely unlikely to bother with SLI.