Zu's are nice speakers. I would recommend speakers that have adjustable bass like the Zu Def mk4's. If you move into a smaller room you can adjust the bass so it does not over power the room. Or if you like the speakers you already have just add a quality sub or 2 with adjustable gain/eq.
Either way adjustable bass will make changing rooms much less painful.
Either way adjustable bass will make changing rooms much less painful.