After all of the advice given the OP elected to go with 2 systems. His prerogative. One advantage of going with 2 systems may be that the 2 channel room and system is optimized for 2 channel listening. I wouldn't mind having a dedicated listening room, but my HT would suffer; all the money would go to the 2 channel rig.
With one system, component upgrades potentially benefit both uses. No reason why a 2 channel system and HT can't peacefully co-exist.
With one system, component upgrades potentially benefit both uses. No reason why a 2 channel system and HT can't peacefully co-exist.