Of the three, I would go C'dale 1st. They are the best Al guys out there in my opinion. Then I would focus on the wheels. Stock wheels on factory built bike tend to be pretty crappy in my experience. Some race on Ksyriums and other stronger race wheels - but I stick to the tried and true hand build Open Pro's on mid-level hubs (they are my training wheels from my road bike.) I may try using my Ksyrium Elites (old race wheels from the road bike) this year since I got great deal on a used set of SL's for my road bike. Then the brakes - get good brakes. Seriously. Finally, everything else should be something you don't mind trashing. I run 9sp 105's (mis-matched brifters in fact! one silver and one black
) I was planning on going single ring this year, but ran out of funds to do it right (dual chain guards, 42T ring, etc.) but that would be great for the muddy courses we have up here.