Need a new PSU but don't which one.

[musikmachine]

Needs to be quiet for room measurements with Arc with good efficiency, modular doesn't matter. I've narrowed it down to a few:

Antec Truepower 550w

OCZ Stealth Xtreme 500w/550w?

Coolermaster Silent Pro 500w

XFX 550w core edition which has a larger fan so i assume that will be the quietest?

There's also bequiet but i'm told that's just a brand name, the other psu's are just as quiet. Just don't know which one to order and i need to within a few hours cause my desktop psu starting buzzing today.

Cheers!

[musikmachine]

I ended up ordering the Antec.