You have an excellent build except for the PSU. That's an excellent MB with upgraded sound (1150 codec), M.2, an x4 PCIe expansion slot, and USB 3.1. Here are some choices for PSU's:
The R9 380 is probably a little bit better than the GTX 960. The i3 comes with a stock cooler so you won't need a custom one. You'll like having a SSD as your boot drive.
If you want to go slightly over the 600 mark you could go back to the full ATX mobo you had in there, I chose a micro atx with larger RAM to give you better performance for the same price. This, however, does not give you ability to upgrade RAM unless you want to buy a new 2x16 set, and you cannot SLI or Xfire on it, although with the card you're looking at, I wouldn't recommend an SLI in the future anyways.
That PSU ain't that great. It's tier 3. Still usable, but where the tier 1 PSU I put in the build fits the budget, I don't see why the major downgrade should be used.
You have an excellent build except for the PSU. That's an excellent MB with upgraded sound (1150 codec), M.2, an x4 PCIe expansion slot, and USB 3.1. Here are some choices for PSU's:
The R9 380 is probably a little bit better than the GTX 960. The i3 comes with a stock cooler so you won't need a custom one. You'll like having a SSD as your boot drive.