be careful about the sugar gliders... they can get mad if you dont have a ton of time to spend with em... a buddy of mine had one and whenever he let it out of the cage and crawl around his room while he was away for lunch when he came back it would jump on his face and claw at him... it was bizarre...
look into reptile pets... ive got a leopard gecko... they're small and easy to take care of... and they can handle being handled on a daily basis
bearded dragons can be really friendly and you can let em run around the house some...
here are some caresheets for a bunch of different reptile pets....
http://www.reptilerooms.com/Sections+main.html