Regarding belt drives, I'm not sure what to think of them. They require a special frame (with the rear dropout opening in the back). Plus you'll have to go with an internally geared rear hub, and no crank gearing.
Which is more expensive, I think, but for me maybe preferable. I think the internally geared hubs let you shift while stopped, which is good for me, because I do a lot of stop-and-go local street biking and I always forget to shift as I'm rolling into the stop.
