The longer the cannister, the deeper the exhaust tone.
I'd stay away from any carbon cans, the 100mm slugs of the v-twin cause harsh pulses that will take a toll on the carbon fiber shells. And they need constant repacking - like once a year or so, or they begin to burn out. Especially at the inlet on the right cannister. Stay with Ti.
Sato's are my favorite, full length, not moto.
You definitely don't need a full system, slip-ons are the ticket.
Make sure your slip on system is for SP2. SP1 midpipes won't work.
With the current exchange rate, the LadyBirds are probably the best deal out there, and their reputation is GOLD! Everyone comments on the outstanding quality and super fast shipping.
The Mori's that RCDevil has are also top-shelf. You should seriously consider those too. RCDevil is a friend of mine, and a great seller.