You probably already know Damien Rice if you know Banhart. If not you'll probably like him too. Also, perhaps Ray La Montagne. A bit more extreme (I guess emphasis on the "freak"), and a female vocalist, Joanna Newsome (I really like "Milk-Eyed Mender", but not the recent release, "Y's"). Perhaps Iron & Wine. Never heard the term "Freak-Folk" ...not sure what to make of that.
Marco
Marco