I was in the same predicament a month ago and went for the BV11-55, I know it's technically their 'entry level' TV but what I think it does is highlight just how stupidly overpriced B&O TV's have been in the past, the days of BV9/BV4 pricing hopefully won't be seen again.
Ok so it doesn't have ALT, but the sound management system will be far more sophisticated than your current setup and you will be able to set the 11's speakers so they can 'keep up' with your other speakers through a multitude of parameters.
BV9 to me is a beautiful TV, but after careful consideration I didn't find it to be a lateral change.