The Expert is $500 more and gives you the following upgrades:
Full carbon fork vs carbon fork with aluminum steerer
Formula C1, hydraulic disc brakes vs Tektro Draco 2
Shimano 105 rear derailleur vs Tiagra
Carbon vs alloy seat post
Better tires (?) - Not a biggie for me, as I plan to replace with Gatorskin Ultras
One thought I had was to go with the lower version, then use the $500 towards upgrading the bike to Ultegra drivetrain components. I would then use the parts that came off of the Sirrus and use those to upgrade my Specialized Crosstrail.
I would appreciate your thoughts/opinions on this.
Which one did you decide to buy? I'm very interested as I have the same decision but my choices also include the Pro Carbon. Ultimately my decision may be made based on availability. Specialized is sold out of the 2014 models.