Be aware that full modular is not an advantage unless you are going to re-sleeve all the cables. A hybrid modular will have the same number of cables potentially in view as fully modular, the full modular just adds more potential failure points, more cost and more resistance.
http://www.tomshardware.com/news/power-supplies-psu,8016.html
Great build all around ... I'd only change two things.
1. 120 GB is too small.... you will be wrestling with cleaning off your C drive every cupla months. Spend $6 on a 250 GB model
http://pcpartpicker.com/product/Ck98TW/samsung-internal-hard-drive-mz750250bw
2. The WB Black is also a bit small ... and let's remember, if it ain't on the SSD, it gets no benefit from SSD performance. Switch to an SSHD and you get 50% more speed in gaming.
You can get that 50% speed increase for no increase in price:
http://pcpartpicker.com/product/ftPfrH/seagate-internal-hard-drive-st1000dx001
Doubling capacity will cost ya $20
http://pcpartpicker.com/product/tR2kcf/seagate-internal-hard-drive-st2000dx001
3. Getting back to the PSU.... Id wanna keep the option open to go SLI or CF and the EVGA B2 750 will do the trick for a pair of 480s / 1060s / 1070s. Price was $48 this morning, $55 at 1 pm and now $65
http://pcpartpicker.com/product/JYyFf7/evga-power-supply-110b20750vr
It is semi modular and again, you will have the same number of cables in view regardless of whether you go semi or full modular ... and, you can extend system life another 18-24 months by adding a 2nd GFX card.
4. Regardless of what you ultimately choose, I'd way for the 1060 drop .. rumor has it that it's faster than the 480 but whether or not that's true is immaterial .... with competition being introduced in the price range, prices wil get more competitive.