really if you are just looking for lightness i would use sram force or sram red if you really are into it, which it sounds like you are. ive heard alot of good things about force but i have never worked on a bike with it. i work in a shop and the few times i have worked on a force it seemed really strong and quality ad not finiky at all to dial in. but really i think force or red would be good and definitly go compact up front. Maybe an ITM bar or FSA or salsa like that other guys said. Or WTB dirt drops if you would like to try them. Of course king headset and tompson stam and post.