Most Hog Islands I have worked with (30 or so), had wonderful temperaments. That being said, I've seen 8' females and 7' males. They are considered a "dwarf", but sometimes..they aren't really dwarf like. :)
I'd go with a Caulker Cay (Cay Caulker) or Crawl Cay, both max out at 5' (the longest ever recorded was around 6'). They stay small and most are pretty docile.
As a matter of fact, I know someone on here who has one listed for a more than decent price. :)
http://ball-pythons.net/forums/showthread.php?t=89143