Apologies as I think I mislead you with that last sentence in my first post. What I meant was I'll be regemming and enchanting to mastery as soon as prepatch hits and remain that way, playing MM, until 102 when I switch to BM.
Either way, I'm going to be leveling in a group so overall performance won't be an issue and it's perhaps arguable that I stay MM as long as I keep 4pc. Meh, dunno til we get there!