Yeah... H. incei are totally the way to go. Get a female and breed her. They breed easily, and are amazingly social.. I have about 30 1.5" slings living with their mother in a 5 gallon. They all keep to one end, and the mom will actually hunt for them and bring back pre-killed prey for them to eat. They crawl all over each other and don't show the slightest signs of territorial or aggressive behavior.H incei have been proven to be ultra-communal. They're terrestrial sorta semi-burrowing heavy webbing dwarfs rather than big beautiful arboreals but you'll still end up with a fascinating little web city to watch.
Check this out: http://arachnofreak.com/forum/forum_posts.asp?TID=3325&PN=0&TPN=1
Well if your looking to make it useful and your finding the communal set up isnt going to work, then why dont you look into converting it into a multi enclosure cage. This way you can make a really cool looking enclosure that houses maybe say 6-10 or so T's. If it isnt clear like glass than I dont know if this would be a good idea. Just my opinion. But if your looking to do a communal I would guess either a p. regalis or a h. incei setup, but I dont have any firsthand experience in this so I dont know if i would take my advice lol.Well, it sounds as though my great big terrarium isn't useful for much of anything.