I use the Cine DSLR head.
I don't know about other heads, but with the Sachtler heads you can go above the payload range by about 1 kilo. The specified range is just that- a range. It doesn't have to fall within it exactly.
I almost got the FSB4, but went with the CineDSLR because it has the largest range of them all, and by forking out the extra cash for a head with a larger range, I'm future proofing my investment further. It can support one of those stupidly large rigs with rails/FF/monitor/battery/matte box, or even a GH2 with a pancake lens. No bounceback either way. It's essentially an FSB head on steroids.
The LS22 is mediocre at best. Like I said, I'd gladly take that over any Manfrotto head under $1k, but if you're spending anywhere near the ballpark of $1k, FSB4/CineDSLR is the only way to go in my opinion. The ACE is nice for the price, but it also has a lot of plastic parts and cut corners. It isn't the tried and true FSB design either, so for me that's a dealbreaker.