If this has been posted and I've missed it, slap me. GPR has released some really nice looking exhausts for the Ten. Well, personally I think they look a bit too "plastic", but they are placed well on the bike. db-killers, +3hp and it saves 10 kilos compared to the original.
EDIT: Just saw that both the GPR and LeoVince exhausts (+ the old acra) are up at OTR at a good price, and I spoke to a guy who works there and he said that they are almost finished with their own system, similar to the one they made for the X/R. It's going to dyno as we speak. They have also added more goodies like a really stable luggage rack and panniers and high front fenders etc are on the way.
Go here.