Trek or Specialized Bicycles are both great. 400 pounds is $800 and that will get you a quality bicycle that will last you for a while. Just be sure and keep it locked up well. I'm considering a Trek 7.3fx myself because it has the best parts for the price. I like drop handle bars but they have "steal me" all over'em. Hey I assume you are from the UK. Go M.U.F.C!!!!