I have no problem overprovisioning a PSU a bit. Say 20%.
It will run cooler, quieter, and more efficiently in the middle third of it's range.
A PSU will only use the wattage demanded of it, regardless of it's max capability.
The only negative to a very oversized psu will be less efficient operation.
As to a recommended wattage, here is a handy chart:
http://www.realhardtechx.com/index_archivos/Page362.htm
Pick a tier 1 or 2 unit from this chart:
https://community.newegg.com/eggxpert/computer_hardware/f/135081/t/45344.aspx?Redirected=true