Thank you all for the responses. Yes, my only reason to upgrade is that I wanted something new and shiny as it has been put.
I guess what I had in mind really was an upgrade to the center channel. I like the RC-64, looks like a real power house beast and with a great deal of sound from movies coming from the center channel I thought I would notice an incredible difference from the RC-7. Would I? Then I was thinking, well, if I upgraded to a newer center channel then I should upgrade the rest as to keep the 'blend' in check. What if I just pruchased the RC-64, would that be advisable? Would I get a noticable change, would that work?
I didn't mention in my orginal post that I have already purchased a pair of RS-62 II speakers that I got on a deal I could not refuse. What if I just added these to my system for a 7.1 setup? Would this work ya think? Put those on the sides of the room and move the RF-5s to the back?
If there is no real upgrade for the RF-7s besides jumping up the the II series and beyond, how about the using the 7.1 system I just described and replacing the center with the RC-64 II? Worth it?
Thanks again and thanks in advance for your advise!