I'm gonna go with the crowd here. Unless you're smoking with a real crowd all the time, a multi-hose is more trouble than it's worth. If you're looking at the Gemini III, look at the price for the single hose model. At $46, you can pick up two (don't forget the HP discount!) for a decent price and should be able to handle most home gatherings. It also lets different people try different flavors.
If you still go with a multi, I'd recommend against a BB down the hose port. Most likely it'll just get stuck.