+1 for the Arca compatible type, not Manfrotto. You'll lose a lot of flexibility going with Manfrotto clamp systems (though I do like -- and have-- some of their ballheads) because they don't fit anyone else's clamps or plates.
Wanted to suggest your consideration of this Sunwayfoto ballhead, which I like very much. What I like most is the clamp itself, which provides panning ability along with the normal ballhead movement. If you look at the picture, you'll see what I mean. Most ball heads move in all directions but, in shooting landscapes, for instance, you may need a constant level for panning, as is used in panoramic shots. If you only use a regular ballhead with the panning underneath, your panning will not be level. With the panning above the head, you'll be level no matter how the ball is positioned. Something to think about that I've found very useful.
Btw, the price quoted on this Amazon page is not what I paid, which was $180. But you can also buy the panning clamp separately and it will fit on any good ballhead.
Amazon.com : SUNWAYFOTO Tripod Ball Head with Panning Clamp Arca Compatible FB-44DDHi Sunway : Camera & Photo
Last edited by Kath; 11-19-2015 at 12:38 AM.