Thanks for all of your replies. I'm in the Tampa Bay area so I can bike all year so I hope to be riding a lot.

Here are the component differences from the 2006 models and I think they are similar in the 2007s. The difference in price is about $350

Pilot WSD 1.2 Frame alpha SL alum/ Fork Bontrager Satellite Plus, carbon/
Wheelset Shimano Tiagra hubs-Alex ally rims/ Crank Bontrager Select 52/42/30 / Rear Derailleur Shimano 105

Pilot WSD 2.1 Frame ZR9000 Alloy/ Fork Bontrager Satellite Plus, carbon/ Wheelset Bontrager Satellite Plus, carbon/ Crank Bontrager Select 52/42/30 / Rear Derailleur Shimano Ultegra