I would second the choice of a brazilian rainbow boa, beautiful and great to have on display...but for a couple of animals that haven't been mentioned that do wonderfully on display and have a very curious/inquisitive nature, would be either of the aspidites, womas and black headed pythons. They do hide, but more often than not if I'm in my snake room doing anything, they will come out of their hides to see whats going on.