I was thinking what I could do is lug the B&W's to local shops and demo the centers with them. They weigh a ton, however.
I suppose I could also looking at simply getting different L/R speakers to match the center, but I'm hesitant to give up the B&W's.
ETA: I just located a single shop in my city that deals in B&W. I'll probably check them out first to see what they have then decide which speakers to purchase.