Remove Windows from the list. -83$
1) Install Windows 8.1 or Windows 7 from MSDN ISO (running in trial mode without activation).
2) Do magic (Exact incantation skipped because... reasons)
3) Upgrade to Windows 10 for free. Your temporary activation will turn into permanent one.

Replace GTX 960 with GTX 970. +115$
You'll be able to run most of the games on Ultra in fullhd at really high fps.

And look again at your motherboard.