You'd be cutting it close since you're advised to have a little headroom.
This site tells you that an R9 Nano requires 550W for the entire system to run, you could skimp on the power numbers but if something goes wrong then the entire system will fail. Tell you what, snag the Node 202 bare chassia sn populate it with a 600W SFX PSU from either
Corsair or
Silverstone, you're going to be fine that route.
Since I also see an i7-6700K in the mix, I'd suggest looking at the i5-6600K or a different chassis since you seem like you're going to overclock that CPU.