Most of the deep extension and sound quality comes more from the number of subs than what kind or even how powerful they are. When going to a bigger room of course it will help to have both more and bigger. The size room you are talking something like Tekton 2-10 subs would be awesome. But they are too big for now.
One thing you might consider then is to get everything on Pods and Podiums. You will be surprised how much room resonance (boom) is energy from the speakers direct into the floor and walls. Huge improvement. You will want this in the new room anyway. Just an alternative since it seems like you may wind up with some kind of compromise either way, this way it won't be with buying smaller subs you might just wind up selling later.
One thing you might consider then is to get everything on Pods and Podiums. You will be surprised how much room resonance (boom) is energy from the speakers direct into the floor and walls. Huge improvement. You will want this in the new room anyway. Just an alternative since it seems like you may wind up with some kind of compromise either way, this way it won't be with buying smaller subs you might just wind up selling later.