I second the big B&W's, only because a buddy has them in a similar room and they sound fantastic. He had some amp issues, and finally got them really rockin' with McIntosh 501's (which he got because they didn't sound good with my Maggies) and the sound is very full and coherent. Great high's and mids and very tight bass.
Look at Albert Porters system, the room looks similar to how you describe yours.
Look at Albert Porters system, the room looks similar to how you describe yours.