I have a Bogen that will extent about 80" from 6' high. I found guy here in town that will sell ott-6 or ott-8 shot. (shotgun shot) and I use about 55# to counter the cantilever effect. It will hold my b800 on a BD with no problem - maybe even Marshall ahhaha. The Shot is about a buck a lb but if you purchase a weight bag at a camera store 15lbs will cost ya $53. You can always buy a cheapie but if it falls on someone or something during a shoot you will regret it.
kind of like this
Avenger | A475B - Baby Combi-Boom Aluminum Stand, Black | A4041B