Full XT with is the best value.
The following will provide the best value upgrades, in this order:
Shadow Plus (XT or XTR) rear derailleur (especially for 29ers or dual suspension bikes)
chain (bit of weight, only ~$15-20 more, but lasts a little longer, so it's a wash in terms of price)
I wouldn't bother with cranks, as weight difference is so small and shifting is excellent with regardless with 2*10. XTR chainrings are nearly double the price of XT.
I wouldn't bother with the cassette as the titanium cogs wear quite quickly on xtr cassettes.
Front derailleur will make no difference.
Discuss light weight issues concerning mountain bikes & parts.
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