Your best improvement will come from separating two channel from surround. Not only will no multi channel processor ever give you great stereo performance, when you have your speaker placement optimized for movies, then two channel sound suffers. And vice versa.
If two channel music is indeed as important as you say, set your system up accordingly and live with whatever sound you get for movies. That also means a good two channel preamp. Yeah, you might lose the surround effect, but what you gain for stereo performance will make up for it. Or go whole hog multichannel and take what you get for music.
The choice is yours. Either make them separate (different rooms), or make compromises.
Shakey
If two channel music is indeed as important as you say, set your system up accordingly and live with whatever sound you get for movies. That also means a good two channel preamp. Yeah, you might lose the surround effect, but what you gain for stereo performance will make up for it. Or go whole hog multichannel and take what you get for music.
The choice is yours. Either make them separate (different rooms), or make compromises.
Shakey