A new 105 set costs around $600 and up....I bought a used Trek 1600 (now 2.3) for $500 off CL already had 105 with ultegra rd. I think everyone is saying it isnt worth upgrading. On the used market (if it sells) a wally bike is worth $50. You are wanting to invest 3x its new price in components and your wheels are gonna be crap.