Sounds like you might need to be careful about latency between these different systems in one room. Maybe it's less of an issue these days but any time you go down the surround sound route it's either very expensive to get quality across the whole system or you spend a lot to achieve a lot less in 2 channel mode.
I'm no expert in surround sound though, I've been down the road a few times but never liked all the wires, not being able to balance the rears and the effect not being that different in terms of sound stage from a decent 2 channel setup, except maybe for science fiction movies.
Sounds like you might need to be careful about latency between these different systems in one room. Maybe it's less of an issue these days but any time you go down the surround sound route it's either very expensive to get quality across the whole system or you spend a lot to achieve a lot less in 2 channel mode.
I'm no expert in surround sound though, I've been down the road a few times but never liked all the wires, not being able to balance the rears and the effect not being that different in terms of sound stage from a decent 2 channel setup, except maybe for science fiction movies.