After carrying in my pocket for 3 days, I have decided to get something to prevent my smallest Mac from scratches and breaking when drops (I did drop the iPod touch and it was close call: one of the edges was scratched and slightly damaged).
It took some time to decide, but at the end I settled for this one:
In white, of course. It is a bit tricky to put it on, but it feels very solid and does not slip.
I bought it in one of the two Montreal Apple Store for $24.95