Yay, an Aeris thread, something I actually know about :)
RC Pikes are great. Ben’s right.
XT brakes are fine as long as you get the most recent batch (Bird know all about this – sorry guys).
Zee brakes – nice but I couldn’t stop the rear of my loan set from rubbing a touch and that stuff annoys me.
XT cranks – typical shimano fit and forget but make sure you put crank skins on them first to stop rubbing. I’ve got an oval 32t Absolute Black ring on mine and it’s great.
Bash guard – worth it (for the bash, not guide), just fitted an AB Taco on mine.
Bars – I’d have gone 780 but I ride a lot of very narrow stuff and 760 just about fits through.
Wheels – get the best you can. EX1501 on mine and love ’em.
HTH.