i am a roady who is interested in buying a mountain bike and would like appreciate some help in valuing a bike for me. i have found a maverick 7.5 xl size the i like on ebay. can you guys tell me what a fair price is for this bike? also would i be better off getting a 29er, i am 6'3" tall and would be using this bike for recreational mountain biking. thanks for all of your input.