I am looking at upgrading from my Trek 1500 (which I have been very happy with) to a carbon frame. The Giant TCR 0 seems to be well priced at about $5k AUS compared to the equivalent Trek. The Giant comes will full Dura Ace gear, where the Trek would set me back an extra $1k or more to get into Dura Ace. How much different is the quality of the two frames? I am drawn to these to makes as they offer lifetime guarantee on frames. Can anyone out there over some pointers about which is the better bike?