I'd love to see a Caveman! I've maintained a fascination with with dinosaurs since I was a kid, so the theme alone makes me want one.
Non-standard pins are fun to be able to experience. It was awesome last year seeing a Joust. I wasn't even aware of the head-to-head concept (not that I was or am a seasoned pinhead). Then I learned only something like 400 were made. That made me both very appreciative of the collector who brought it and curious how anyone manages to bring valuable gems to an expo with hordes of people, who aren't necessarily going to treat these games like they should, and not babysit their game the whole time or bite their nails when they're away.
I know it's counter-intuitive to the expo format, but I think I'd be too OCD to be comfortable bringing a game I really cared about (all of them! ). I know you have to bring games in order for there to be games at the show, so how do collectors get over it and enjoy themselves, or is that not a problem for most? Even having 6 family members over the other day to play my games had me too anxious to be able to really relax and enjoy myself, not to mention random things kept breaking...