Ok, I don't want to start another thread...
Is 680 with ballhead overkill for me? 70-200 with 1.4 tc is the biggest lens I have plus I am only 5'5" tall...
I am torn ... 676, 679, 680...

A ball head can be handy - but I find it can get quite unweidly - it moves on too many axes - there is a cheap manfrotto "tilt head" that is just about ideal - I have an arca-swiss-type clamp on it to be compatible with my tripod. I have mine set so I can shoot down and up - versus tilting to the side to switch from landscape to portrait. I use an "L" bracket to go vertical.
RRS just came out with a similar type of monopod top - much netter weight carying capacity, and of course, the immaculate materials and workmanship that is a hallmark of RRS products. About 10x the price of the manfrotto piece, however...

