I agree with chief. I'd check out a different brand psu. I know it's kinda pricey, but this TX 650: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005&cm_re=corsair_650-_-17-139-005-_-Product
is an excellent PSU as you can see by the reviews.
Also, are you getting the i5-2500 or the i5-2500k? there is a big difference in that the 2500K allows for HUGE overclocking potential, whereas he 2500 is limited to a few hundred mhz.