I'm a huge fan of Lange and a good friend of mine has several, among them a Lange 1 and the Datograph, but in platinum. IMHO those are probably the most beautiful watches i've ever seen... and if you don't like the dial side, just turn 'em around and look at the stunning movement
The Lange 31 is IMHO not a beauty... the dial looks too plain and the case is just too big. 47mm is good for a vintage looking Fiddy, Radiomir or Big Pilot, but for for a classy and sopfiticated watch like Lange. But i think it's awesome they managed to get a 31 days power reserve from one mainspring... most impressive!