Not the ultimate expert but . . .
It sounds like you have a nice system already.
"(Rotel) preamp RC970BX+ power amp RB971"
Unless the Rotel is missing some Sound Processing signals that you want, or you are just itching to get a new system, I would wait.
I think the next year or two is going to be a big boom in AV receivers and pre/processors, as well as all other equipment.
I was in a similar position, I was "fixin't" (as we say in Texas) make the jump to high end equipment, but I was happy with my current receiver, then lightening struck, literally! I HAD to buy a new receiver, at once, and I choose to go to a Pioneer VSX-1014 9(about 400 bucks online) and wait a year or two, and see what new comes out.
Then I am going to move this receiver into the bedroom.
Actually, I am quite pleased with the 1014, and am do not feel like I "settled" on something less, and I did save some money too.
It seems that HT equipment, is like computers, no matter what you buy, in a year or two, it wil be obsolete anyway.