I say take the money and spend it on the new wheel set. Buy a much better hub and all that. It would be nice to have a spare but if you think about it, you really dont need one (plus it would cost some mad $$$ to get one that you can just swap out wiht out transfering stuff around.

IF you have that money thn do it, just i think that the money will be better spent on stronger parts then many parts.

Jared