The Coolmax looks like a great deal. The Rosewill RP series PSU is actually Coolmax rebrand. I am currently using the Rosewill RP550, it serves me very well; my system is S754 2800+ OC @ 2.54Ghz(282x10), 2 burners, 2 HDD in Raid 0 setting, 6800U OC @ 460/1250, watercooled with 10 fans (2x70mm, 4x80mm, and 4x120mm), I get very solid rails.