With the size of the room, only something the size of the really huge Westlakes is going to cut it (the ones with the dual 15" woofers). Of course those are rich boys' toys... An old pair of JBL4343s might work (just), if you can find a pair that is. Or, there are those mythical beasts the Harbeth M40s (if you do get these, don't forget to invite TonyL and myself over for a listen :D ).