I own a B&K 50 and it works very well for movies, with music I use it as mainly background. I am compiling a seperate system for two channel music now. I don't think the B&K is bad for music it is just not where it shines.
For movies and multi channel music DVD's it really shines. As someone stated earlier the Reference 50 can be had for around $2,200. I think you would have to spend $3,000 to $4,000 to get significantly better sound.
From a feature standpoint I love it, flexibility, lots of inputs/outputs including digital, flexible bass management and multi-zone capabilities.
If you are not set on seperates you can get some A/V recievers that match the features.
It depends on your budget, I wanted to allocate less than $3,000 in my theater processor and spend more on amplifiers, source and video. I knew I would be investing in a dedicated system soon for music. I am very pleased with the B&K.
As always if you have more to spend you can always do better. Isn't that what makes this so much fun$$
