where in nj is carlstadt? havent ever heard of it.
anyway, whenever someone asks for bjj in the nj area i gotta give props to David Adiv. he's located in fairfield now. he's royler's #1 guy in the states (black belt obviously), has done very well in mundials and pan ams, and has been a judo blackbelt for over 20 years. also, performance jiu jitsu recently brought him in their place to do a seminar.
imo, he is the best instruction in nj. he's really articulate and explains techniques well. he also does throws in the beginning of most classes and talks about the little details that very few bjjers will know. he taught most of the classes during my brief stay there last summer, and if not his top brown belt, jason tabor, is absolutely sick - not only that, but jason rolls with everyone after class, and rolling with a really really good brownbelt every class is an awesome experience.
to there!