I have a trek 4300 with stock wheels. Recently while fixing a flat i noticed my front bearings were grinding so i dropped both wheels off at the LBS where i purchased it to have them checked.Well they tell me the bearing cones are pitted from dirt but the bearings are fine (approx. 400 miles in 4 mos. on the bike).My question is i'm thinking about just getting a better wheelset like rhynolites or comparable and i want a good heavyduty hub with sealed bearings to limit some of the dirt getting in. Can anyone recommend a good disk wheelset with atleast an XT hub for $200 or less?