I've gone for 'Other'...mostly because some of the moons of Jupiter and Saturn seem more interesting and active than at least the rocky planets. I'm talking Titan, Ganymede, Europa....
Well then you're either a 'All of them, then I want to go someplace else', or you're a 'Other. Please explain. :)'.
When I went to school they said there were nine planets. Now they say there are eight, and dwarf planets were never even mentioned. If you count the dwarf planets in with the bigger ones, it does kind of make you wonder just how many planets are really out there in our little system.
They're certain they haven't got them all - there are other bodies which have been discovered but not yet classified, because they don't have confirmation of the requisite data.