Wattage wise, you're going to need a PSU that can deliver
600 or so watts to the entire system. Quality wise, I'd suggest you look through the
PSU Tier list and choose a unit that is as close as possible to Tier 1.
You may want to state your current full specs like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Then include the budget to your PSU purchase and your location + subsequent preferred site for purchase.