I like both of your choices. It's really hard to choose. I don't think you can go wrong with either. I would just try them both in the boutique and decide from there.
I have the Berkeley and it has become my favorite bag! I think it is just a tad dressier than the Trevi, IMHO. But I think both the Berkeley and the Trevi are the best looking of the Damier line. You can't go wrong with either!