I would have the priest and locks go tailoring on all three. The good thing is that it lvls quick and you get some nice epic gear at 70.

If you want max power go enchanting on all toons for the ring enchant. Is it worth it... it is totally up to you (for casters you get 24+ spell power), but inscription is still an unheard of yet so it might be better then enchanting.

With my lock and priest team i went enchanting and tailoring on all of them.