Return to Saturn

While they were derided as being "Battlestar Galactica missions", Cassini and Galileo provided (and in the case of Cassini, still provides) returns up and beyond their original specifications. Jupiter and Saturn are almost solar systems in their own right; sending a single-purpose mission that far is almost a waste.

So it is interesting to hear about plans for future missions of this class. For example, how about dropping a hot-air balloon to explore Saturn's moon Titan?