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Have you tried a pair of Danner's?

http://www.danner.com/boots/strikertm-ii-emstm-side-zip-uniform-boots.html

Not sure if they fit all your needs

Just read some of the reviews and the zipper is in question. I love my Danner's but never have tried any with a zipper.

By far the best boots I've owned, (Danner).
My daily wearer is the "striker II 45" series.
They make the "Elk hunter" for Cabela's. Best hunting boots as well.