go rim brakes, v-brakes or cantis. disc breaks are great for muddy weather and if you are not racing pro because they are not cross legal (so I have read)
disc brake enabled cross fork, save some cash and get the one off nashbar.com (
http://www.nashbar.com/profile.cfm?c...20Road%20Forks )
drivetrain yeah what the hey use your xt drive train