Salamander, strange PSU issue, I've not seem any issues with the CWT built PSU's reported before. I thought people used Corsair TX850's and HX850's without issue on the Classified. You could use a Corsair HX1000 (dual 500w Seasonic), Antec Signature 850w (Delta) - both are very nice units. Check out JonnyGURU's PSU review website for all you nee to know about the two I mentioned and others.

Perhaps also email/PM Shamino, he should be able to shed some light on your problem.