I just built a very similar system with the FX55 w Zalman 7700cu heatsink, 2Gig OCZ rev 2 mem, Lian Li 1100, dual WD Raptors in RAID 0, Maxtor 300 Gig Diamondmax,MSI 6600 GPU, Asus A8N-SLI and the very quietEnermax NoiseTaker v2 600w. Plenty of power and plenty of room for the PSU. Rock solid...