A gtx760 only needs a 500w psu.
The cx600 you selected would work.
But, I might buy a different psu.
1. the cx line is not considered as high quality. Tier 3 on this list:
https://community.newegg.com/eggxpert/computer_hardware/f/135081/t/45344.aspx?Redirected=true
Buy tier 1 or 2. Seasonic, xfx and antec for starters.
2. Your cpu can drive a much stronger graphics card. I would look at 650w or 750w to allow for that.
I have no problem overprovisioning a PSU a bit. Say 20%.
It will run cooler, quieter, and more efficiently in the middle third of it's range.
A PSU will only use the wattage demanded of it, regardless of it's max capability.
I like the rest of the build except:
Do you really need some feature of full retail windows 7 professional?
Home premium will do for most.
And retail is nice in that it can be transferred, but you can buy 4 copies of home premium oem for that.
It looks like windows 10 will be a nice and possibly free upgrade that will do what w7-pro will do.
I think 120gb is a bit small today and will fill up quickly. Look for 240gb.
Prices for 500gb are so attractive that I might omit the hard drive entirely. You can always add one later.