Don't forget you're doubling the weight back there. I'm a minimalist. I got a carbon fiber stubby from Trident and used a high-mount intermediate pipe which keeps the single sided swingarm completely visible, as well as the space between the undertail and the hugger open and visible. I'm all about aesthetics, too, and I love the way it keeps the unique single sided swingarm features totally visible.
You can check out my album if you're curious as to how it looks.
Not to mention, it has done some good things for exhaust tone and performance.
Everybody is different. Good luck in your search. Sorry, I don't have any leads for a dual. Check the websites of all the major players (check out the 1050 exhaust sticky at the start of the forum for some company names -- likely they have stuff for the 955, too)