logger,
I'm going to take some flak from saying this but I've never been politically correct.
Most benches are set up for little guys because most benchrest shooters are little guys.
Big guys will almost always have a problem with the dang things. I can use short benches for awhile but if I'm there for several hours shooting I get tired and cramped up and my accuracy (and my back) suffers.
There seems to be no standardization but I've only seen a very few that were taller than "painfully short".
Consider making yourself a lightweight shooting platform to add a few inches to benches. You could use 2x4's and plywood.
I built my own benches from free plans offered here and adjusted the benchtop height to suit me...
http://www.boogerbench.com/$bob$