Manfrotto 234 with a Wimberley C-12 clamp for my Arca-Swiss-type plates.
I don't see the need for a ballhead, personally. Of the three axes, the tilt head covers pitch and rotating the monopod on its foot covers yaw, and those are the most important axes. I'm almost always using a lens with a tripod collar with the monopod, and the collar covers roll.