I'm not necessarily a new bicyclist, however; I'm new to getting serious about the sport. I have always had crappy bikes that did not fit me right, were too heavy, and didn't last because of poor quality. So today is the day I want to get serious and do some research. I am looking to buy a new bicycle and I need some advice about what bike to buy. I am not a pro bicyclist. I think I fit in the intermediate category so I'd like to buy a bike accordingly. So to make a long story short....Please recommend some bikes you guys think will work well. I'll be using this bike for transportation (15 miles a day) and recreation (bike trails and forest preserves) so I'll need something that can stand up to some terrain and be fast and light.