You demoed the RX series with the 1910? I'm guessing you demoed that at SGT Home Theater. I'd suggest you go back to do an audition with a different surround speaker to compare, then make a decision. This is just me, and I'm probably in more of a budget crunch than you are, but if a sub 10k or even sub 5k speaker can give even 70-90 percent of the performance of a 20+k speaker, thats good enough for me.
Was talking to a sales guy in one audio shop regarding HT. We were comparing 2 lines of speakers. Without auditioning both, the first one sounded pretty good for HT. When we listened to the 2nd line, difference was huge. But we were discussing that even if you went with the first one, you'd still be happy with it when you went home because for HT, ignorance is bliss. As long as its loud and you get surround sound, especially if it was your first setup, you wouldn't look for anything else.
Going back though, I have a feeling that you want the rx1. For me, if you are going to put it on stands at the rear of your room, I'd seriously consider it for the aesthetics as well as the obvious benefits of timbre matching and SQ. But if you are going to mount it and have it blended some place in the room, have a listen to other budget friendly options as surrounds and let your ears decide.