I don't think you'd need that much power. You could get the Corsair 850w and you should be fine.
I agree Corsair 850 will be plenty. Additionally I saw PCP&C has a new 900 watt PSU for a good price:
Newegg.com - PC Power & Cooling Silencer PPCS910 910W ATX12V 2.2 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS SILVER Certified Active PFC Power Supply Compatible with Core i7 - Power Supplies