How about some PA equipment? Just about every town that has a music store, be it chain or independent, will have a bulletin board that lists used PA gear. Another good source is the local trading post type paper & even the local newspaper. Used PA gear is an even greater bargain than used audio gear. With those high ceilings, you could suspend the spkrs & they would cover most of the room. I'm thinking a LCR configuration w/sub would work pretty well.
All you need is a decent front end to go with it & you're set.
All you need is a decent front end to go with it & you're set.