You dont have enough money for a decent power supply but youve got it for a $800 GPU ;)
Somehow I think the 2080 might be a bit overkill for you personally .
Look for RX 580, GTX 1060, GTX 1070, GTX 1070Ti, GTX 1080, RTX 2060, RTX 2070 they will all work fine with a 650W PSU.
Hope this helps.