Dear Brad, I hope you will have a great time in Germany and at DLD. Your SIM research pretty much covers the major players, either deal is good. I don't have any experience with their service quality though as I have never used prepaid cards in Germany. The deal for the German Rail Pass is good - provided you actually travel to cities that are 4+ hours away from Munich (Frankfurt, Hamburg, Berlin, etc.). If you stay in the Munich area, you get better deals for local connections.