GTP - for display only, but they are just so beautiful.

I also voted Crested Gecko for display because ours will jump out of her leaves in a second to come say, "HELLO!" on the front glass and watch football. I'm not sure they are necessarily everyday pets for everyone - ours has mating frustration, so we're frustrated with her half the year, and they can be too flighty for some, but they are great pets for those wiling to work with them too. So, cresties as not a strictly display animal, but has my secondary vote.