I love the Tivoli GM! and even though I really don't like the Damier line, the Trevi PM is Fabulous, those are my two picks, both classy and have really great details.
I would pick Tivoli GM or Trevi PM, but Trevi has a smaller opening (even comparing the GMs in both). I don't think, as an everyday bag, I would want to continually deal with the opening of the Trevi PM. Try it out, with your stuff, in the boutique first.