I don't think that they are eau de cologne. Aren't they eau de toilette?
Anyway, be careful with choosing the eau noire. I like it as much as the next guy, but it can be a tough wear. It definitely is an evening only scent, so unless you go out ALL the time, go for something a little more versatile. Plus, it is the sort of scent that I think one wouldn't want to wear too much. So, if you spend the money for a large bottle, you might end up stuck with it forever.
The Cologne Blanche or Bois d'argent are both a little more wearable anytime.
But, of course, it is up to you and dependent on your own personal style. Personally, I like Knize ten instead of Eau Noire. Both have that leathery, smoky essence, but the Knize smells like an Austrian monarch.