This is my first post on this forum, and actually any forum! I am new to the biking scene and I am trying to pick a new starter bike. I found a trek PDX 2011 for $500(which i think is a good deal) at my local shop. i think this would be a good bike to start using for commuter rides and some mild cyclocross training that i can then build up to be more aggressive as time goes by. for the time being it will primarily be used for commuting to school and work, and for casual group rides. I am trying to determine if this is a good deal, a good bike, and a good idea in general. thank you so much and i look forward to your responses!