The Trek 800 a good start up bike. Nothing fancy to worry about, good start up parts, acceptable weight, and a reputable company. Can't beat that. Plus you are getting it from a shop that will be able to repair it and keep it in good shape for you. BONUS!
Be sure to take it in for repairs after a few rides, the cables and such will stretch initially, but a quick tune up will fix that and keep things happy.
