What do you mean? There are plenty of things out there that fit this description.
Out of the ones you listed, I would go with the Brazilian rainbow boa. They are the easiest to find and the prettiest of that complex IMO. They are also fairly easy to handle and although I have seen a lot of aggressive ones, I have seen just as many tame. If you want something smaller you could look into sand boas. Also don't exclude the colubrids- there are plenty out there that are awesome. Corn snakes are a good starter but also look into some of the beauty snakes for something a little different. Bull snakes, pine snakes, and gopher snakes are one pf my favorite non venomous groups too because they have a showy attitude but when handled regularly, rarely bite.
Look some of these up and get back to me so that we can start narrowing this down. Also, be more specific, are you wanting something colorful? Low maintenance? active? Give us some details on the type of enclosure you have or want and what your budget is.