Gotta go with other, hoss. Probably partly because I have no taste, but also because the only other choices involve reading a book in German. Even when I lived in Germany and spoke the language proficiently, I hated it. I'm not saying that they're all written as badly as "Mein Kampf" but any book written in that language will not win my vote.
Serious answer: the best book ever written was written in Spanish. It's hard to read, because much of it was written in a style that was already archaic when it was written 400 years ago, but if you have the patience, try to read it:
I read the first volume in a university Spanish course about 30 years ago, and struggled with it, but I managed to get through it and write my report. I reread it recently, with the help of a spanish-english dictionary and have managed to appreciate its wit and wisdom.
James Joyce's Ulysses
comes a close second. The main problem I have with Joyce is that he writes in the same style as I do, and it puts some readers off. Even me.