The Gorrilapod focus was a little too big for me. The SLR-Zoom works great if u do not overload it, you can always count the weight of ur existing setup. I have mounted almost 2kg of load including my 5d2 on it with good stability.
There is of course no future-proofing if you decided to get even heavier lenses next time, which in anycase if you are worried then get the Focus..
Ryan