I'm certain this has been addressed here before, but a quick search didn't reveal any answers. I'd like to invest in a decent tripod and head that will work with my Speed Graphic as well as with my Nikon F100. The threads beneath each camera are a bit different - is there a head out there that will allow the use of both cameras? A quick release plate of some kind? My budget is far from unlimited. I'd like to find something serviceable for about $250 tops. Is this possible?