If you're changing the dropouts (as stated earlier) this is a good time to use a dropout that allows you to split the rear stays for belt drive. The Alfine 11 should be a good choice for a road/trail bike, the steps are even, eveyone that has a belt drive learns to use it and then loves it. JTEK is coming out with a barend shifter so drops will be easy to combine with Afine 11. I have a drop bar IGH bike for the road, I'm thinking about changing the frame to a Vaya so I can have a Thudbuster and rear disc: