all snakes can bite. sooner or later your going to get a bite. they are mostly from human error.
it all depends on what you want. i have a jungle python that is great...loves to climb an 'display' himself. i've read the IJ pythons are smaller then the jungles. not sure if they like to climb though.
of the 3 you listed the IJ would be your best bet if your looking at space issues. i have always wanted a hogg island boa, too. i've read the are real docile with handling. rainbow boas are cool too only require a high humidity level.
if you can't decide....get all 3!! just do your homework about each one. also.. you can not house them together if that has crossed your mind. 