Hello friends!

I'm trying to decide on a new road bike and I'm hoping to get your thoughts. I currently weigh 265 lbs and would like to get down to about 200 lbs. I'm 5' 11" tall. The priority for this purchase is to lose weight and to be able to ride for 2 or 3 hours at a stretch.

Here is what I've been debating:

1) 2010 Giant Defy Advanced 3
2) 2009 (NOS) Specialized Roubaix Comp
3) 2010 Felt Z85
4) 2010 Cannondale Synapse 5
5) 2010 Cannondale CADD9-5
6) 2010 Trek 2.3

I'd like to hear your experiences and thoughts on these bikes.

Thanks.
Nick