Thanks for the ideas everyone!
I don't think I will buy the Koala. I'm worried that the hard ware would scratch too soon and because it's my first LV wallet, I want to buy a very classic one.
I'm still doubting between the Alexandra and the Pochette wallet. The Alexandra is the perfect size for me and it offers a lot of space, but I'm worried that it would look too bulky. The Pochette wallet seems very easy to use, only the size is a bit of a problem, but I think I'll just have to get over the fact that it'll stuff my multicolere pochette.