Wow! I never even heard of Navajo before. Looks pretty tough. Icelandic would be awesome to learn but I imagine I'll have more than enough of a challenge with Finnish.

From how I see it, learning Esperanto before my first foreign language is like when I'm weight lifting, I start out by 1 warm-up set which in turn makes the full sets with maximum weight easier to handle. Seriously, I'm quite surprised that no one on this thread has agreed that learning Esperanto before Finnish (or any other language) would be beneficial. I'm constantly finding quotes like this from many literature and linguistic websites. "Studies have shown that people who learn Esperanto for one year and (for example) Japanese for one year end up speaking Japanese better than people who learn Japanese for two years." or "whether your target language is something common like French, difficult like Chinese, or obscure like Yiddish, studies have shown that learning Esperanto first may help you in your study without being a waste of your time".
Being that Esperanto does seem more interesting the more I look into it and the fact that it has tens of thousands of books, including movies, tv shows, radio broadcasts, podcasts, hundreds of periodicals published regularly and the idea that it might help with my first foreign natural language... I think I'll spend at least 3 months and see how it goes.