1DmkIV with 70-200 f2.8 IS and my pro camcorder. So I don't want something to flimsy.What camera are you going to put on it?
Hmm. Methinks you really need two heads - a ballhead (or a pan & tilt) for the 1DMkIV** - and a fluid head for the camcorder.
If you go for one or the other it will only perform one of the jobs properly.
(** Pan & tilt probably not much use with a 70-200).