One other thing. With these small ball heads, they are not that stable if you have a heavy lens; even the Olympus 12-40 is a bit much. I use a nodal rail slide to balance the camera/lens, which also solves the droop problem (when you tighten the ball head and let go of the camera, it drops down a bit with the weight).
Thanks for the info. My largest setup is about 850g (360g of it is on the lens). If I can get a head that will hold about 3-5lbs, I should be good. If I can swap and use the ball head on my current tripod (which holds over 10lbs) then that might work too.