Hi, so it has been a long time since I have owned a bicycle but have recently decided to look into purchasing one mainly for fitness and commuting. In my searches on the internet as well as looking in a few bike stores a few models have jumped out at me. Kona PHD, Specialized Sirrus, Cannondale Bad Boy and Rocky Mountain RC line. I will be commuting maximum 20km a day. Does anyone have any experience with any of these bikes good or bad?? Thanks