Listening Nirvana in Tiny Hideaway Room

In typically neurotic audiophile fashion, I continue to obsess over upgrades, speaker placement etc with my main system in my main room inside the house.

I have recently abandoned the completion of a new office in a detached garage, as I have found myself traveling into my other office in NYC much more frequently than expected.

As I looked at this garage space, I realized that the walls and ceiling are asymmetrical, with a high point of 9 feet or so, although the room itself is quite small -- say 10 by 12 ish.

So I wondered if I might be fun to escape to this space to listen to music and/or watch movies -- away from the distractions and noises of the house, family, TV telephone etc.

Has anyone succeeded in assembling a jaw dropping system in such a small space? Or have you had success with a particular speaker that could sound and image well in a small space?

Does this sound like fun? .....or should I just plow more funds into the big rig?