For a clutch? MotoGuild!
Seriously, do it yourself. The clutch is NOT HARD to replace, and you can install a better clutch than OEM:
http://www.barnettclutches.com/2141/triumph/0/0/2012-triumph-tiger-800-xc.html
Get a replacement gasket, too. Make an appointment by phone. Talk to them. Go to MG. Two hours later, you'll know your bike 10x better and feel awesome for doing it yourself, under the supervision of someone who has done this a hundred times.
My experience is with the Silicon Valley MotoGuild, where Patrick is an awesome resource. Based on what others have said, there are also excellent folks in the SF (Treasure Island) MotoGuild.
Watch how easy this is on a
YouTube video.