Burning Wheel info request

Hey Judd and Jim (and potentially anyone else reading this who knows) I want to buy the Burning Wheel RPG, but as I'm looking around the net I'm having trouble figuring out what book or books I need for the core rule set, and/or to successfully run a game. While my grp is largely into D&D they also liek to try new things, and I have been curious/interested in BW for a while now.

Anyway, if you can tell me the title or ISBNs of the books I need, or even where to order them, I would really appreciate it. Thanks!