It's a good power supply, and I'm sure would power your build as it stands just fine (especially with your modest overclock). I would encourage, however, to spend the extra 14L on the 750 watt
Compare the specs page on both here:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139028
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139040
You'll find 33% more 12V power for 25% more price. With that only being 14L, I can't stress how much of a relief it will be for you in the future knowing that ANY single Card solution (even the highest end) will not necessitate you having to REinvest in a power supply.
The CX 750, you'll notice is a bit bigger and 60% heavier. It's just a much higher quality than the 600 (which cannot supply the full 12v X46amps =552, max draw is 522, so really more like 43.5 amp 12V rail) While the 750 can supply its full rating, more efficiently. Like a good case or monitor, the power supply is something you shouldn't have to worry about upgrading as time goes on if you make a good, quality, forward thinking purchase intially: saving you lots of $$ in the long run.
So as time goes by and its four years from now, unless they drastically change the ATX standard: you'll CERTAINLY still be good instead of maybe?
Good job researching the 760 more closely as well.
