The only reason I got the XTR in the first place was because it was cheaper than an XT cassette. I've got an XT RD as well. Ideally I'd like to not have to replace anything but the chain, tires and brake pads over the duration of the trip.

Tovi, I don't think I explained well... Its not so much the boringness, more a possible motivational issue... I have no qualms with any of the scenery either. We are going to be going east across the prairies no matter what, its just that the half way point is so close to home that I could see us losing motivation and ending the trip early (not so much a concern with me but a serious concern with my friend who often likes to just give up and end things early when possible). Starting in California with a final destination of home pretty much precludes that from happening. Thanks for the tips though, I'm looking forward to checking out your site.