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Try sunwayfoto quick release clamp. I like more than RRS and Markins. You will see difference when you get chance to try.
I just started using a 60mm SunwayFoto leverclamp. At $72 delivered, it was too tempting not to try.
On another thread, someone (who only uses RSS) warned that with an adjustable clamp, it might be dangerous that the user has to decide "how tight is correct."
This seems like a valid concern, until you actually use one of these. I use RSS plates on all my gear, including an L-plate for my 5D, and had no problem quickly adjusting the Sunway clamp for a perfect & secure fit. It's very obvious when you are getting to the point of "too tight," so then you just back off a little bit. You can back of a LOT before anything gets too loose for comfort, there's a very wide window of useability there, so I am quite confident about the setting being safe.
Afterwards, I put a small dab of "Goop" glue on the adjuster, so it's not going to change.
These clamps don't look as nice as the RSS, Kirk, etc, but they work great, and feel good to the fingers.
The safety-catch also works perfectly, you can't open this thing by mistake or by catching it on something.
I don't see any reason to spend more, unless it turns out that these wear over time. It seems very well machined, so I don't expect that to be the case.