I bought a power supply and just for fun one of those PSU testers. When I went to test a second wire with the tester the PSU went dead. I'm now running my computer with a new PSU and knock on wood everything appears to be fixed. I ran the GPU / CPU Aida 64 stress test for a minute and no crashes. So I think everything is fixed.
I was quite happy to find a
Antec EA-650 EarthWatts Platinum 650W 80Plus Platinum Certified Continuous Power Supply for $25 off and picked up two as I was pretty confident the PSU was the issue and my wife was needing one for her new build. It says it has brown out protection. I'm not sure if that means it will be better able to stand up to a brownout unlike my late thermatake or if that just means it will protect the rest of the computer in case of a brown out.
Thanks Koitsu and Dissembled for add to the thread. If my computer blows up tomorrow I'll be sure to update the thread but I have a good feeling things are resolved and I won't need to.