I was goign to purchase another license for the vB3 portion, but since IB is tellign us to go find the bugs and vote on which fixes need to be fixed. I have contirbuted my fair share of bugs, but I am convinced that xenForo will not screw me. Buying more licenses from IB will never happen.
Take your time with xenForo, get it right. My communities run excellent on vB3.x code sets, no rush needed. I will look to phpBB or Dupral for solutions until xenForo is ready.