Since you mention Specialized, drop be the shop that sells them.

Trek is in the local , here .. the Aluminum Domane looks good..

2.0 Tiagra 10, 2.3 105 10.

the Iso-speed dampener at the top of the seat tube should absorb a bit of
aluminum's infamous harshness,,

4.0 is carbon frame, Tiagra 10, 4.5 is Ultegra..