CORSAIR Builder Series CX430 V2 (CMPSU-430CXV2) 430W ATX12V v2.3 80 PLUS Certified Active PFC Power Supply
$44.99 and a $20 rebate makes it $24.99http://www.newegg.com/Product/Product.aspx?Item=N82E16817139026
ENERMAX NAXN ENP450AST 450W ATX12V Power Supply
There are a few to choose from and the choice naturally is yours to make but you do want to stay away from the noname brand and try to go with the proven quality brands. Antec , Silverstone , Corsair , Enermax , Cougar and Seasonic.