My pick

http://www.amazon.co.uk/Miserables-Signet-classics-Victor-Hugo/dp/0451521579/ref=sr_1_10?ie=UTF8&qid=1359063873&sr=8-10

There are quite a few excellent English translations, but this was my pick. I saw the 1958 Franco-Italian version and the new music version films; they can't match the book. The book not only tells a story, but also the background. I had a profound understanding on the French revolution, its impact on on freedom, equality and democracy, and its legacy on humanity. There is so much to say. You'll enjoy it.