Looking to buy an off road bike. At least 350cc and a max of 500cc. Doesn't need to be road legal, as it'll only be used off road. And have a rough budget of around £1,500 to £2,000 to spend. The thing is. I don't have a clue what brand/type to look for, what to avoid, and what's a good price etc. So does anyone have any recommendations, or know of any good forums?