I had dunlavy sc III's in a room a little smaller than that and I agree 100 percent that dunlavy 4,5, or 6's should work extremely well in your room.
I ran tube amps with mine as well; audiovalve challenger 180 monoblocks and the sound was stunning; my only complaint was the bass could have been better but I always thought that was related to the sc III's having only 8 inch drivers; the 4,5,or 6's have larger woofers and should pressurize the room even better. Dunlavy's are still a tough speaker to beat with even todays makes.
Also now and then Duntech speakers show up in the used market and should be considered as well; I know they are similar to dunlavy but I do not know how the link is established.
I ran tube amps with mine as well; audiovalve challenger 180 monoblocks and the sound was stunning; my only complaint was the bass could have been better but I always thought that was related to the sc III's having only 8 inch drivers; the 4,5,or 6's have larger woofers and should pressurize the room even better. Dunlavy's are still a tough speaker to beat with even todays makes.
Also now and then Duntech speakers show up in the used market and should be considered as well; I know they are similar to dunlavy but I do not know how the link is established.