I run all this setup on Corsair AX-750 without problems:
AMD Phenom II 955 X4 Black Edition
NOCTUA NH-D14
MSI 890FX-GD70
4x Corsair 2GB 1600Mhz CL9 DDR3
3x Sapphire 5830 Xtreme
1x WD Velociraptor 300GB
2x Samsung F1 750GB 7200RPM
2x Samsung F2 1,5TB 5400RPM
6x 120mm fans
What OS are you running? I assume Windows if it's also a gaming rig. Win 7? 32/64-bit?