I'm buying my computer via Cyberpowerpc
Would you advise using the standard (significantly cheaper) cpus, or the big company, official 80+ one (such as corsair)
Big brand CPUs will be more reliable, I would stay away from "standard" PSUs. If you dont want to swap out your own PSU, get a the better ones to start with.
A lot of subpar PSU cant perform at thier rated wattages, typically melting down when pushed evne close to their limits. ALso thier power delivery is dirtier.
650 Watts - Corsair CMPSU-650TXV2 80 Plus Power Supply is a $63 extra over their standard PSU, this is your best bet, unless you are building a monster of a PC.