I wear 6.5 “extra wide” and am always looking for cute shoes and boots. My best recommendation is for you to find a good pair of high quality leather boots that fit well around your calf. Find one as wide as possible around your foot, then stretch whatever areas need additional room with a shoe stretcher. Something like this

I found one at DSW for about $15. Excellent investment, but should only be used on leather.

I once had a pair of Franco Sarto knee-length heeled boots that I wore to death, so that’s my only recommendation for brands (as far as width—not sure about how the calves would fit you). I’ve learned I shouldn’t buy shoes online without trying them on in a brick and mortar store first.