I would vote 1) anthracite - you can get so many colors into one! But definitely try to see it in person. I've heard that people either love it or hate it. and 2) Marine. I love Balenciaga blues and find this color to have great leather.
I wear so many colors and just want some thing that will go with every thing but in a dark shade that is still fun and a neat pretty color
I think since you already have two Cities, your next bag should be the Day style. It is very comfy and easy to carry around with you. I promise once you own a Day you are going to be hooked. You might want to try a Black Day, or Sandstone (if you can find one). Or if you want another City style i think Anthracite would be perfect.
I wish I could see the day IRL as well as the twiggy, I have only owned the first and city style and love them both. Oh how I wish we had Balenciaga close so I could go in and strike a pose with all the styles and colors... WAIT this could be dangerousIt does sound like Anthracite would be just perfect for you! An Anthra Day would be fabulous...