Ok.. well I have 3 yellow anacondas. They all bite, some more than others, but in my experience they're temperamental. They're pretty easy to keep, although they are messy, and babies can be hard to start feeding.

As I said before I have 5 red tails.. they're very cool snakes. Lots of different localities with different looks, and morphs too depending on how much you want to spend. BCI boas especially are usually quite docile.

There are different kinds of dwarf retics.. the superdwarfs stay quite small.. long but thin. Last time I checked they were pretty expensive still.

The Jampea dwarfs are more common, but they still get really big. Not as big as a mainland retic, but still I have seen pictures of 12' ones. I don't have any first hand experience with them.