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[Billyherington]

.

 

[dante4]

Just buy something with platinum certificate, personally I'm using bequiet straight power 12

 

[MountainBofh]

I've have excellent luck with Seasonic power supplies in high end workstations over the years.

 

[nexox]

This list is what I use to choose workstation PSUs: PSU Tier List rev. 17.0g - Cultists Network

As you can see studying the list it's a little more complicated than just recommending a specific brand, and paying more doesn't always get you much.