Maybe the Seasonic X series 650W is a better fit? its L 160mm x W 150mm x H 86mm. what do you think?
Seasonic quality is one of the best if not the best according to the reviews. The X is an excellent choice if you have the budget. Its considerably more expensive than the others. Just checked its almost 80 bucks more expensive than the corsair CX.......
If you are not overclocking, then piority for a PSU should (IMO)
1. Power
650Watts is plenty enough to drive any card you want unless you upgrading to SLI/Crossfire in the future. With a single GTX1080, you only need a 500watts PSU if not overclocking and i expect even less power demand if using a GTX1070.
2. Reliablility
I've blown 2 PSU before(cheap Antec and cheap Coolermaster elite series), the coolermaster elite killed my mobo as well.....at least thats what i think. Used a Seasonic for my last build and all is good, so i'm kinda biased towards Seasonic.
3. Performance
If overclocking or running some weird cheapo equipment, then this will run high on the priority.You will need a high performance PSU if want to go heavy overclocking for voltage stability. Since you are not overclocking and Asus board are usually tops, this should not cause a major issue
Infact i wanted to put in a X650 for myself but its 160mm deep(most psu are 160mm deep btw). The case i using is the core 500.....and 160mm psu will supposedly cause a very tight fit. So i opted for a 150mm psu instead.