I have always had a huge soft spot in my heart for the Voyagers. It's so amazing to me that they are STILL working, still gathering data! In grad school a few years ago I took an elective about the geology of the solar system and wrote a term paper about Neptune. You're not kidding when you say nearly everything we know about Neptune comes from Voyager 2. We've learned a few more fascinating things since then, using Hubble, which has only whetted people's appetite for an outer planets mission. Gimme!