Thanks to all who have contributed to this thread. Having listened to many brands, price points and advice, I have now installed the RC-62 centre with RF-82 fronts and RS-52 surrounds powered by the Denon 2807. Needed a subwoofer that was smaller in size than the Klipsch so purchased the new Whatmough-Wise impulse (Australian manufacturer) which is just brillant with a 10" driver (quick response for music dvds) and such low distortion that it can be as loud as you like.
The RC-62 centre is great - clear on dialogue and good tonal quality. The RF-82s could have been the RF-62s with no loss of enjoyment on movies but with better bass extension they are more suitable for stereo music, although the 62s with a good musical subwoofer (which generally means a 10" woofer) also sound OK. If only watching movies and music dvds, the 62s are fine. For the surrounds, I have found a trend for newer dvds to put much more information in the surround channels, so go as big as you can install/afford. I settled on the 52s as a compromise. Go the RS-62s if you can.
For me, this is the ideal system for the family room 5.5m long and 4.5m wide. A door on the front wall in the right corner and a door on the side wall on the left rear makes speaker placement difficult. Non-Klipsch enthusists may be interested to know that while the old Bose cube system was easier to install, the new system is superior in all the important areas.