Even before I saw that you have b&w's, I was going to suggest B&W Matrix 801 SIII's. That's if you have the room for such gigantic heavy speakers, & if you want to go to a more powerful amp(s). Theil 3.6's are another suggestion. Also B&W Matrix 802 SIII's, but you'll need more power for either of those as well.....
I had the Matrix 802's in a smaller room, with 240 wpc. Gorgeous on Orchestral music. Merlin VSM's would be nice if you want speakers that don't need a lot of power, but I'm not sure how they'd work in that size room.
I had the Matrix 802's in a smaller room, with 240 wpc. Gorgeous on Orchestral music. Merlin VSM's would be nice if you want speakers that don't need a lot of power, but I'm not sure how they'd work in that size room.