If you're going to have to run a tensioner, and if you decide to run two front gears, there isn't much of a difference after that point between IGH and derailer gears. I honestly think that I'd just go with friction shifting on the gears and call it good. Then you don't have to clean out as much. I've had the gears stuffed with so much snow you can barely see the cogs and still haven't had chattery shifting with friction.