How much power supply for new build?

How many watts do I need for this system? I keep getting a few different numbers from different sources. What are your views?

MOB - Gigabyte GA-P67A-UD3
CPU - Intel Core i5-2500K
RAM - G.Skill 8GB (4x2GB)
GPU - Sapphire Radeon HD 6850 (x2)
Hard Drive - Western Digital Blue 6gb/s 500GB
Case - Corsair Graphite 600T (w/3 case fans and water cooling for CPU)

Thanks for the help.
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More about power supply build
  1. A quality 750W unit should be fine.
    Something like a Corsair HX750 or an XFX 750 would be great.
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