What is the benefit of a second amplifier .

Dtc is on the $$$...A separate 2 channel amp will benefit you if you wanted to venture more into the 2 channel mode. Try a Rotel RB-1572 amp for those B&W's you might like it as I was impressed with this combo from my local dealer. But this will force the movement of an interconnect and speaker cable
I have kept my B&K 200.7 amp and use it for my home theater that is processed by a Pioneer Elite (through the pre-outs). These do run a mix of speakers as they fit for my arrangement but do run a pair of B&W CDM7NT as the main front L & R and Martin Logan Motion 4's for the side surrounds. But I too have a hybid 2 channel system that runs either through my Coda CSi integrated amp to a pair of Tyler Acoustic Woodmere II's or my Modwright SWL 9.0 to the B&K for some tube to solid state action. I have this tri-fecta easily changable via an interconnect and speaker cables. I purely use my B&W's for home theater and the Tyler's for 2 channel. I am blessed with a very large room that gives me the capability to run such a large front of speakers without losing its stage presence. The new Oppo BDP 105 is my only source since I run a variety of music and movies via hdmi or dedicated 2 channel. I really wanted to have a universal unit that could perform well in both departments and I have been pleased so far.

I agree with Mechans. 2 channel and HT should be totally separate systems.

Rrog - if you have 2 independent systems, do you advocate having 2 sets of front speakers, next to each other? That is what Mechans is suggesting. That seems unnecessary in most cases, although Shakedown seems to like it. Most people do not have room for 2 sets of large speakers next to each other. I wonder Shakedown, do you have a wife :)

The advantage of a home theater bypass situation on the 2 channel pre-amp is that it allows one set of speakers for L&R in both 2 channel and 7.1. If you have a nice set of L&R mains, why not use them for both? Rather than use cheaper HT mains right next to the big boys, why not invest the money is a very good center to compliment the big mains?

My Cary/Levinson/Cremona setup gives me great 2 channel and I use a Yamaha receiver and ATI amp for the 7.1 setup (minus the mains), but with a good center hooked to the ATI. (The 200.7 has been moved to a second 7.1 setup.) The L&R from the Yamaha go through the Cary home theater bypass. I really do think this hybrid setup gives you the most flexibility while allowing you to tweak the 2 channel or 7.1 system as needed.

Unlike Shakedown, I am not interested in changing cables when changing between systems. My wife is very tolerate and loves the music, but I do not think I could sell her on having a second set of mains. We did build a dedicated theater with 7.1, but not everyone can do that. We still use the hybrid system for 7.1 a lot also, especially for TV. Its critical to have that NFL crowd noise blaring from the surrounds :)

Anyway, the bottom line is that I think the OP can do better than the 200.7 for high quality 2 channel.

LOL...yes I do have a wife and she totally approves of my set up...its not her gig but she does enjoy it when anything is playing...Our room is a converted sunroom that is 30 x 35 feet with the farther part of the room is her computer central while the other half is the entertainment area. While I am not a big fan of moving cables, I have simplified that process for my ease and it does work for me (not too lazy yet). Prior to my purchase of the Coda CSi integrated amp, I was using the Modwright pre-amp and its HT Bypass to the B&K amp and totally loved it with the B&W speakers...I just wanted to up the game a bit on the 2 channel and find something that would fill this tremendous room. Luckily the best of worlds...happy wife and hubby too...

I actually advocate a sparate listening space for 2 channel.
2 mains next to eachother are thought to produce artifact by sound pressure cause the "quiescent" pairs' drivers to vibrate.