Totally new to "wanting" to bike ride.. Ive dropped 20lbs from buying a ski boat and just using it, swimming, skiing,wakeboarding etc... I feel alot better.. My? .. Im interested in a mountainbike, this will be used to ride dirtroads, town, a few intermediate local trails etc...Ive been to all the box stores saw the mongoose,next,Schwinn, brands etc... Im 6ft2" 250lb athletic-ee,good balance,decent reflexes etc... I feel as if im too big an "ol-boy" to ride a 26" say 19-20" frame... I feel like one bump or rock/curb itll be toast... Whats a good beginner mtn bike without killing the pocket book...Ill be honest and looked at a Schwinn.at wal.mart for like 150... comftorable to me but feels like a toy, what do i do, splurge on a more xpensive unit, go w a 29" tire... im clueless and lost.... did find some nice diamondbacks at Dicks sporting goods that had tubless tires i felt would work.... suggestions folx. Thanx..