Check out Bxpanded, they make a toothbar called the Piranha, which is supposed to be really good for clearing brush and digging up plants and small trees. I just ordered one for my
BX25 for $229. I believe they make custom lengths up to 6 feet. Here's a thread discussing the Piranha.
http://www.tractorbynet.com/forums/kubota-owning-operating/284670-piranha-tooth-bar.html
