Here's another vote for the Roubaix.



I like the geometry so much that I built up a Secteur with Ultegra Triple to spend most of its life on my trainer, and for Horribly Hilly types of rides.

At 180 lbs., you're not particularly heavy so don't worry about that. You are right about the geometries -- the Roubaix and Secteur have more relaxed geometries (i.e., taller head tubes) than the Tarmac and Allez.