Regarding Carpet Pythons. My Irian Jaya has not even once offered to bite anyone, while her sister from the same clutch(I don't have her I do know the guy that acquired her though) was pretty bitey with certain people, possibly a handling or scent issue, whatever the reason the two have completely different personalities.
For the OP, I am loving having both my Irian Jaya CP and my Peruvian Longtail Boa (Boa constrictor longicauda) They take handing very well and often are reluctant to return to their enclosures once out.
Others I know that have either Dumeril's Boa's Or most of the smaller locality boa's seem to think just as highly of their snakes.
That would round out my short list of suggestions.