In my opinion, a well designed tube preampsgenerally out perform solid state. Yes, tubes need to be replaced and cost money. This can be completely inconsequential or a big deal depending on the preamp… preamps with tubes for amplification and for the power supply are more costly…but it depends on usage.
But backing up a bit. The biggest compromise is likely to be combining a audio system with a home theater. This is generally a huge compromise of the audio system. One I would not, and have not had to make. These two systems have vastly different objectives. If humanly possible, best to keep them separate.
I would recommend we go back to your current system, components, restrictions on space. If I had an alternative of a living room combined HT and audio system and a HT in the living room and a walk in closet with my audio system. I would choose to have two systems and listen to my audio system in the walk in closet.
I would think about that first… then start thinking about how to move forward.