My 7ft Guyanan red tail female, ranks way up there. She is sweet, and so docile, a real lady and enjoys TV as well.
My Dumeril's are close. Sweet disposition, not too eager to go exploring, and so beautifully marked. Seem to enjoy being handled.
However the Hog Island Boas are my all time favourites. Amazing disposition. Beautiful colour schemes (nature at it's subtle best) and a joy to handle. They have just about everything going for them. I recommend Hogs to anyone who is restricted to only one or two snakes.