I would stick with the 912, then you don't have to play 'what if'. I've collected 3 of them from ebay over the last few months so they are not that hard to find.
I've always found power conditioners to have a negative effect on dynamics, 'flattening' the overall sound so I plug amps/receivers directly into the wall. But then I live in an area with pretty stable power and not a lot of severe electrical storms. I still plug the rest of my gear into a SurgeX surge protector. YMMV.
Good stuff, thanks. My plan is to collect 3 over the coming months as well, but did want to get some feedback about 919 as well as 812 to expand the choices. This whole thread started because of @gedlee's discovery and of course @James spilling it for members to take advantage. I'm surprised that his statement about the the sound quality of 919 "to be indistinguishable from the 912
" didn't catch more attention so to speak.
I recently purchased a SurgeX (SX1120-ip) as well after reading that some *class D* amps can be hooked up to the conditioners. I guess the vsx is a diff animal.
I have an 812 and to my ears it is just as good, plus I like the remote much better.
Thanks for the feedback. 2nd person to back the 812 after @brother love