PSU requirements for gtx 560 ti sli/6950 hd crossfire

I'm getting a new gaming rig in a month or two and I'd like to know what kind of psu I'll need to run the following:

Gigabyte Gtx 560 ti oc OR some radeon 6950 (planning on getting a second card for sli/crossfire)
Intel Core i5 2500k, planning on doing some overclocking, but probably not beyond 4ghz
8 GB corsair ddr3 ram 1600 CL9
1 tb 7200 rpm Hdd (probably some WD or seagate haven't decided on the specifics yet)
1 Dvd drive
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More about requirements 6950 crossfire
  1. 750W to be safe.
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