So, if anyone has been through this, what's the best recommended route for keeping as much as possible intact:
SMF -> VB 3.x -> Xenforo
SMF -> VB 4.x -> Xenforo
SMF -> phpBB 3.x -> Xenforo
SMF -> IPB -> Xenforo
I have both a VB and IPB license, and obviously phpBB is free, so all these options are open to me, but I don't want to go down a dead end route without the benefit of some experience from others here.