Having read The White Spider first in English (and read it many times) and more recently in the original ("Die Weisse Spinne", funny enough), this is a book well worth learning German to read. Although I probably found it easier to read having done the English translation to death first.

And after you've read Die Weisse Spinne, read Sieben Jahre in Tibet, Wiedersehen mit Tibet, Mein Leben, read all of Harrers stuff. What an incredible life- and to fit it all into just one lifetime. A really incredible story, and a wonderfully humble writer.

The other books I enjoyed reading in German were, funnily enough, translations from the English original: The Harry Potter books (basically childrens books so easy enough to read in German without getting tired with the effort) and the Agatha Christie books (short books so your attention doesn't wane with effort, easy to follow plots, and much repetition to reinforce the vocabulary). However I've got to admit that as a kid I devoured all the Agatha Christie books in English, so there may well be an element of recidivism in my electing to read them now in German.