I dont really know alot on dwarfs...
Bali, Jampea.. Super dwarfs ( you should ask corey Woods on those he has some..

)
I know that Kahane will have some Dwarfs Yellowheads sometime this month, (im planing to get one male from them)
Theyre is not much info on dwarfs unfortunatly on the web..
http://www.newenglandreptile.com/
they have some jampea there, you could ask them some info on them
Ive been told that Kayuadi's are the smallest ones, Kayuadi is an island near jampea...
Anyway, You should get alot of research on the web...
Talk to people who actually own some adults..
This is all I can tell you, hope it will help a little..
Btw, Bali's are Beautifull ones!!

they CAN go up to 14-15 feet but usually stays around 10.. I think it is a real good deal considering that normals can get more than 20 feet long..
Good luck !