I am looking out for a good quality PSU that could handle my PC. My config is as follows:
CPU i5 2500k
RAM Corsair Vengence 2x 4GB
HDD WD Caviar Green 1TB
GPU Radeon HD 7850 1 GB
Any good 550-600w ps will handle your system with overclocking. Link your vender for more advice. Antec and corsair are my favorites; also xfx and ocz.