I just ordered the Stans No Tubes 29er conversion kit for $60 from Amazon today (free 2 day shipping).

Next thing, if you don't use them, convert to 1x9. Easy weight reduction, more ground clearance.

Depending how much you want to spend... might want to look into a SLX or XT crankset. The external bearings really stiffen up the crank (which is good, less flex when you hammer down) and it cuts a lot of weight by eliminating that cartridge bb.

Id have to look up the specs, but from there you're probably looking at a lighter stem & bars; these are normally "boat anchors" on good, but affordable bikes.