I would go with a canvas bag in the 80# range, maybe with an anchor spot on the bottom if you can find it.
I would be wary of 100# bags in general if you are going to do any kicks. I had an Everlast C3 Foam-wrapped 100# heavy bag. I busted the bottoms out of two of them. The first I attributed to my bungie anchor (they have anchor points on the bottom) putting too much stress on it. So I didn't bungee the second one and the bottom blew out of that one too. If you are going to want to practice "kickboxing" then get a taller bag designed for that. I think the pure boxing heavy bags just aren't designed to take impact to the lower part.
I had an old 70# canvas everlast one and, in addition to knocking it all over the place cause it was lighter, I eventually beat it to death (13 years of punching and kicking it several times a week).
Full disclosure: I'm about 6' and 245 lbs. I've been training various things for almost 14 years now and I can hit pretty hard. I also use my bags for practicing Thai-style kicks full power. Everlast replaced my bag with the taller Muay Thai bag (which I can't seem to find on their website) at my request. It moves more than I hoped, but it doesn't show any signs of busting after a few months, so I'll take what I can get.
Regards,
jlk