The build looks excellent. I don't think, however, you will need a PSU of that high a wattage. maybe step down to 600 watts to save a few pennies? Also, the R9 390 would be a good alternative to the GTX 970 (depends on whether you like team green, with Game stream, G-Sync, Geforce Experience, etc, or team red, with Freesync, mantle (which is dead), eyefinity, trueaudio, etc.). Their performance is so similar in benchmarks that it really depends on which way you want to sway. I THINK there is a way to plug a USB 2 header into a USB 3 board and have it operate, but I'm not sure...
Here is a good PSU that might save you some: http://au.pcpartpicker.com/part/evga-power-supply-100b10500kr
The build if I did it:
http://au.pcpartpicker.com/p/PXpDgs
Only now am I appreciating how much more expensive components are in places besides North America... If you have a buddy living in the US or Canada, have him buy the parts and mail them, then pay him back. It might save you some money (but shipping can be an ***).