As others have said, a second bike, that way, when ready, you can just jump on the nice, fast bike and go, rather than undo for fast riding, redo for commuting. I have two bikes, my fast road bike and my, what I call, SUB. It started life as a mountain bike, but I never really took it off road. For being heavier, it rides fast and is fun. Here's some pics if you want ideas on possibilities. http://www.flickr.com/photos/freehee...7626439068685/