According to Toms's PSU tier list the CX series is a Tier 4 PSU which means:
Tier Four
No Japanese capacitors found. Only Taiwanese capacitors and may even include Chinese capacitors. Very basic safety circuits or even thin gauge wiring used. Not for gaming rigs or overclocking systems of any kind. Avoid unless your budget dictates your choice.
So, it's really not recommended skimping on the PSU which such an expensive system. You should consider an EVGA supernova G2 750w gold PSU, which should accommodate your needs very well.