Quite frankly all of those PSU are recycling center material.
If your budget is really really tight, take an extra shift or two at work,
skip all the high flight brands and buy a NEW non modular PSU from a company like FSP Group or CWT
which will set you back around 50 dollars for 650W brick with good quality components and adequate construction.
It won't have all those pretty logos and fancy modular cables but at the end of the day FSP and CWT are ODMs that
manufacture a good chunk of what you see sold under all those sound brands featured on Tom's hardware