I think the aluminum bell crank set is what BDS was talking about when he said steering rack. Avid makes a good set, too. Stock plastic units are a pretty poor design and break too easily.

I don't recall if the RS comes with the big bearing rear hubs or not, but that would be a good upgrade, too, if it doesn't have it already. Either FT set or B44, if I recall correctly. Little bearing wear out quickly in rear hubs.