I need to know how large of a PSU I should get for my rig:
FX 9590 (possible overclock)
R7 270X
Asus M5a97 R 2.0
Corsair vengeance 8 gb overclocked 2400
Water cooling
Possibly a few fans
Suggestions under $80 are welcome
what kind of water cooling do you have. You realize that motherboard is not on the recommended list provided by AMD for that CPU right? Here is more info on what AMD recommends for those CPUs. http://www.amd.com/us/Documents/FX-9000_Install_Guide.pdf
Unless you've already bought it, I'd strongly suggest not getting the FX-9590. It's massively power consuming and overpriced. It also probably won't work on your motherboard.
I don't think the h80 is a good choice, you should probably just go with a nice noctua air cooler, it will more than likely perform better for you on the 8350 than the h80