i always thought the unltimate xc bike sould be a epic witha fox f80x. go with the fsa os 115 to drop a couple grams. easton carbon flat bars if i where you. are you planning on using a seatpost lol thomson elite or if you can find a masterpeice for cheap on ebay. pedals, eggbeaters. saddle i am thinking a fizik gobi
should be a wicked fast bike.