I haven't been riding bikes for very long. I am twenty years old. I have rode dirt bikes since i was five so I'm pretty comfortable on two wheels. I'm looking for a new bike i think i have it narrowed down to two, its between the Motobecane 700DS or Dawes Roundhouse 2500. Please tell me what one you would go with and why. I currently have a Walmart Mongoose XR-75.