We did Panarama. It was fine. They hit most everything. Plus, I used the RS guide and other sources and tracked down every sight in the old town area and we visited some of that on our own as well. Our favorite part of the Panorama Tour was the drive into the mountains and to Mondsee to see "the wedding church". A friend just did the bike tour (Fraulein Maria, I believe) and absolutely loved it, however they did not go to Mondsee which for me, was a top priority.
My library had an absolutely wonderful DVD for a crazy fanatic like me. It was called the Sound of the City and it was perfect for getting reading for Salzburg. I'll warn you that it is hard to fine.