After troubleshooting, I've ended up with a Corsair HX520 in the main box, and I believe that's the Seasonic-based line. I've got a Topower-based OCZ unit in my pseudo-HTPC. I do have an FSP in my wife's box, but it was a PN-series, and made before the current stream of problems.

I'm pretty sure modular PSU's will be something I'll look for in the future because it's so nice.