Shaggy, if you have more sitzplatz, count me in with Katrin. Or we could drive if there is a larger group. I actually did the bus trip from Nürnberg, two years ago. I will find out the company, but it is the similar bus reisen that have the ski trips in winter. No frills, arrive and watch the Opera, and then you have the late evening to walk around, and the next day to explore Verona. You also are right near Lake Garda, which is also a nice excursion. It was beautiful; I saw Tosca (great) and Aida (overdone), but the best part was the surroundings in the colloseum!
Found this link from Munich ab 145 €
http://www.munichbus.de/
but I am certain there are better deals