Listener,
Long years ago when I just got out of high school I picked up a kick ass (for me) 2 channel rig - B&K amp, Superphon preamp and Polk RTA11t speakers. I was always interested in (at the time) Pro Logic and tried it but it just wasn't ready yet. Within the last three years we decided it was for us and I sold the amp and preamp to fund the purchase of an HTB. Theater was excellent and everything we hoped, but two channel sucked. Since then it's been my goal to integrate the two into one system that does both. Yes, there will be compromises to both, however, I don't have a choice. We've got no space for two separate systems.
I think over the last two years I've gotten very close and am one speaker upgrade away from being very happy with things. I just placed an order with Klaus for a pair of Lorelei's and a Nemesis center to replace my polks and the CS400i center I've currently got. From my experience I think you really can integrate the two and get the best of both worlds. This is the way I've got stuff set up:
When I listen two channel, it's PURE two channel and the same for Home theater. I took the pre outs for my mains out of the Denon and ran them into the preamp DVD input. Then when I calibrated the system I noted where the volume on the preamp was and marked it with a small piece of tape so that the volume gets set at the appropriate leve. It goes like this
Two Channel
Source - Sony DVP-S7700
DAC - Scott Nixon Tubedac
Pre - Philly Audio Blues 7b - (TUBES!!)
Amp - Odyssey Stratos Stereo Extreme
Speaker - Polk RTA 11TL
Home Theater or TV
Source - Panny DVD player or Sat Box
Processor - Denon 3802 (also powers rear surrounds)
Pre - (Pass thru only) Philly Audio Blues 7b
Amp - Stratos for Mains and Newcastle AM9080 for center and side surrounds
Speakers - Polks, CS400i center, f/x 500i side surrounds, RT25i rear surrounds, SVS CS-2039 w/ 250watt plate amp.
Cables are Groneberg TS Premium IC's and Speaker with some Triphazers thrown in as well.
Unless you do a lot of 5 channel music I don't think it's THAT important to match surrounds and the front three. The front three are important to match however and that's why I went all Odyssey.
As for the speaker comparison I spent 6 months reading everything I could and I think with the Sonus Faber, ProAc and Lorelei you're in the same vein of sound - all very musical, maybe not the last word of detial, but excellent at what they do, emotion, involvement and musicality. The ProAc and Lorelei actually use pretty much the same drivers (in the 2.5 anyway) I think the big thing Odyssey has going for it is your getting at least as much or MORE speaker for 1/2 the price (new vs. new). The deciding factor for me along with price was as Klaus and others always preach, it's about synergy - and the Lorelei's complement your system well!! PM me if you have any questions or want to discuss further and good luck!
Brian.