XTR is good, but very expensive. It is meant more for hardcore racers and weight weenies.
I would recommend either LX or XT. Both are good, and more reasonably priced.
Go to your LBS (local bike shop) and talk with someone there. Things like this are their job, and with few exceptions, they are very nice and won't oversell you. Support your LBS!
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"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws."
--Plato
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