basically, the shimano freehubs are of such a bad quality they always wobble, even from new. just run it untill it dies. after that i would reccomend a hope pro2T, they're a good price(£130) and verry reliable. as for a rim, a dx32 is about as good as it gets, 38mm wide and strong as you like. lots of people have run them in mad frames. the hub is available from tartybikes and the rim is available branded as a BMF from chain reactions.