Actually, Cooler Master PSU's are fine as long as you stay away from the Extreme Power series.
@ pablopicasso: I'd look at the Antec HCG 620, Corsair GS700, Corsair TX650 or Cooler Master GX650/750, depending on the rest of your build.
For most part, a 650W/700W PSU will be more than enough to handle a general build with two 560Ti's. 1000W is completely overkill, you can run 3 GTX560Ti's with add-ons and overclocks with 1000W, without even coming close to it's limit.