I ordered the exotek aluminum spur hub and drive shaft to drop some weight, the sport3 weighs in a little heavy for our VTA. The guys at the LHS helped me eyeball some Spurs since the Hpi high speed set isn't due out for awhile. I picked up a 72t Kimbrough spur for a Tc3, to test fit and it fits as long as you don't mind running 2 screws instead of 4. I let the guys at the LHS know because there's a bunch of guys waiting on the high speed set.
Another problem area for some seems to be the plastic turnbuckles, they keep the car from tracking straight so upgrading them would be a good idea. I'm test fitting the few extras I have before ordering a Lunsford set.