bike for half-ironman... my local shop?

A number of good choices. 

What kind of budget are you considering?  The difference between the Specialized "Comp" and "Expert" is the components.  You move up from 105/Ultegra to Ultegra/Dura-Ace (and nicer wheels).  Will you notice a real difference in performance?  Maybe, but only you can decide if it's worth the extra $650. 

What kind of temperament do you have when it comes to gear?  If you won't be satisfied with anything less than top-shelf stuff, then get the bike equipped that way (it'll be cheaper than upgrading over the next year or two).  If you'd cringe at replacing a $150 rear derailleur, then skip the top-of-the-line Dura-Ace (or Campy Record or SRAM Red) components. 

It looks from the shop you are looking at that you are somewhere in the Rochester area.  That is a good shop and highly respectable.  I am not overly familiar with thier product line, so I can't really comment beyond that.

You may also want to check out the Geneva Bike Shop as well.  They gave me great service.  They probably wont be the cheapest when compared to some of the large on line retailers, but they know triathlons well.

I had Jim, the owner do my fitting.  He did a great job!