Thanks @ronkent.
I moved from the 212's to the Ref 31's. I really liked the 212's, just found the 31's to offer slightly tighter/faster bass for 2-channel. I'm really picky about sub integration. IMO the wrong sub or poor setup for a sub(s) can do more harm than good, especially for 2-channel. The 31's are not very good for HT. Although I have HT capability, I really only use the setup for DVD concerts which I enjoy. I added a JL Audio sub for LFE for the rare occasion we watch a movie.
I have 2 power plants because I wanted to have the headroom for 3 high current amps plus other components. I have heard a difference in the past with amps plugged into power conditioners but after 3-4 trials thus far, I haven't been able to convince myself there is a difference with the regenerators. SQ is the priority, but I intuitively like the "clean power" benefits and added protection beyond the whole house surge protector.
Btw, I can identify with your "upgradeitis" comment. My position of "now I'm done" seems to have a half-life of only 12 mos. or so. Unfortunately, I have this affliction with several other hobbies beyond audio!
All the best...

