In my opinion, cooler master 600 may be only a little better than Antec NeoHE 500. Both have 456 watts on 12Va. Neo has 456watts continous, don't know of CM.
Neo gives 456A @ 50C, does the CM give that at 25C or 50C?
Also, you can consider Antec NeoHE 550 which would probably give even more...