Also isn't 80PLUS Bronze rating kinda terrible?
It's not great, but I wouldn't say terrible. From jonnyguru:
"The XFX Pro 850W is 83%, 85% and 82%, which puts it at 80 Plus Bronze."
A gold would be, at most, +5% efficiency.
Right, but at 850W that 5% adds 13 cents a day at ten cent power, plus the additional 55W of heat needs to be done something with. 60 bucks could get you a Gold-rated 1KW server PSU and not have to screw with a rebate or worry whether or not it had the right cables, since it seems information is pretty contradictory.
60 bucks is decent for an 850W PSU, but you gotta remember you get what you pay for.