yeah do like bcarter007 said, run the kit bearings for now, order the Avid ones and when you rebuild the diffs and stuff, just replace the bearings then. I ran the kit bearings for a while on my first D8 and they were fine. Just make sure when you order the Avid ones, get the ones with black rubber seals. Also be a good idea to order several sets of clutch bearings to keep on hand since they wear out fast anyway, no matter what brand.
Tim