If you get the baby spy, I think blueberry must be the best color (though I am probably biased). I just think the color fits the bag's shape and size so well. It's really like a berry! And the color is so multi-dimensional.
VAT stands for Value Added Tax (or something like that). It is 19.6% in France. If you live outside the European Union, you can file to get some of it refunded when you leave (about 12%), assuming you spend at least 180e in a single store in a single day, and the store participates in the program.