Bearded Dragon perhaps? They are quite popular, and very tameable. I do like Golden Geckos, or a Marble Gecko... they are very beautiful and very unique. I know that Flying Geckos are very interesting, but I'm not sure they are all that tameable/holdable. Blue Anoles are cool.
It really depends on what you're into, or what interests you.... my best suggestion is to go to your local reptile show and see what they have avalible and from there, see what lizard you like most