The reappearance of the RF-7s convinced me to take a big risk and replace my RF-7s. In short, if I've really fouled up, there is a way back to new RF-7s.
I've ordered 4 RF-63s to match my RC-64 center. The RC-64 was needed to fit under my new 60 in. plasma. If the RF-63s just don't have as good of a sound stage or lose too much slam, then its back to the RF-7s. The only 7 series speakers that I will keep are the RS-7s for surround back spealers. I'm not too worried about bass with dual RSW subs and Sunfire amps for the RF-63s.
I get the first two RF-63s delivered on Monday. The second pair is on back order. The whole idea is to have as close a timbre match as possible all the way around for 5.1 music and still have strong speakers for movies.
I'm going to try the RF-63s crossed over at both 50 Hz and at 80. BobG convinced me to try 50 Hz on the RF-7s and he was right after a great deal of experimenting.
Bill