Originally Posted by Excel>
I would replace the rear derailleur to the sram x.o, replace the rear cassette to the sram pg-990, replace the chain to the sram pc991 hollow pin and replace the front derailleur to the shimano XTR Twin Pull.
sounds like a waste, upgrade the drivetrain when it wears out, and upgrade derailleurs when they break. You aren't really gonna save that much weight there if that's what you are planning. Just get the bike and ride it.