I would shoot for a bike that is comfortable and can haul a few things. Quite a few people around here use either touring bikes or mountain bikes with slicks. I have a Bianchi Volpe which is about 5 or 6 years old now and it has been a very dependable, pleasant ride. I know Salsa, Raleigh and Kona has similar equipment. The only thing that scares me a bit with newer bikes is that you need really good locks for when you lock up.