I do not have an existing AV receiver or surround sound system. My existing system is a mix of recent purchases and older / vintage technology which still workd very well.
front speakers - B&W 801
Preamp - Bryston 2B
Power amps - 3 x Bryston 4B amps (only 1 used for 801's, 2 spare units)
DVD - Onkyo
CD - Adcom
Cassette - TEAC
Tuner - Yamaha
T/T - NAD

Products I am considering to purchase to build a surround sound system:
Denon 3803 AV Receiver or Onkyo TX-SR800
B&W CC6 center speaker or Audio Research AR4C
B&W DS6 Surround speakers
B&W ASW 1000 or Axiom EP 350 or Cambridge Cube 15 sub woofers

I have read many AR reviews on the above products but integrating/matching my existing system to the new products will be an " investment" which and I do not want to make any costly mistakes.

Any comments, suggestions or insights from the audiofiles and techies which you would like to share?

Thanks