From my personal point of view, I'd recommend not bothering with a head at all and just mounting straight onto the monopod. I used to try using a head on the monopod, but got much better results without one (using a 1D mk2n and now mk3 with a 300 f2.8 and 1.4x and 2x extenders) after being recommended this approach by Andy Rouse.
Agree with the previous comments, I would recommend to use the Monopod directly with a clamp or a tilt head. Acratech makes a great dampened tilt head.