im wondering why your i7-4790 is clocked at 3.8GHz or if thats a typo. i had it in my old rig, and it was clocked at 4GHz, with a 4,2GHz turbo.
I also had a CX750 PSU in my old rig, and i had no issues with it.
Other than that it seems like a great build wich will give you hours upon hours of great times