I'm looking at picking up a monopod, most likely a Manfrotto 680B. I know you can screw the body or lens foot right on to the top of the monopod, but is this ok? Or do you need a head? If so what type. I have a Markins Q10 ballhead and a Jobu Jr3 head right now. This will be used with either a 70-200 2.8 IS or 300 2.8 IS.