The dealer didn't mention which pulley-- but did say that the pulley they use does not require the removal of the supercharger or a press. Because of that, the install is much cheaper. They also said they've done several. They will still honour the warranty. They are also installing Sparco Tourino 2 seats for me in 2-weeks.

I feel better about the dealer doing it if anything goes wrong during the install, since (hopefully) they are much better equipped to handle it. On my last turbo car I'd do anything-- becuase I had another daily driver... but the Mini is my only car right now, and I need it to work-- so there is a limit on my modifications.
I'll have gone from stock to seats+intake+pulley+strut bar+subwoofer! Pretty awesome.
-Scott