I want to get into some biking, for exercise and enjoying it with the family. I am 285 , could be 250. I am looking to getting something inexpensive maybe from craigslist. What would you recommed for a mountain bike that is under 400? I am going to take time and look. We are on a budget and a new bike is n ot on the list. I know serious rider plop down well over a grand but that is not me. I just need something to tool around in.