I've only hunted Colorado twice, but the N GA mountains where I hunt every year are every bit as steep and rugged. The altitude makes a huge difference though. But I've settled on a hiking type boot for my hunting. I haven't owned insulated boots in 20+ years and haven't missed them. That is what I wore in November of 2018 in a foot of snow and morning temps of 10-12 degrees when I last hunted Colorado and they did fine.
Lots of options and it is very personal. Sierra Trading post can be a good source, but they are closed for now and their website isn't even up. But if you can find what you like in your size can save a ton of money. You can often find boots at 1/2 the normal price there.
REI is also a good choice, especially if you're a member. They aren't any more expensive than the same items anywhere else and the 10% dividend each year along with the 20% off coupons they issue members several times a year makes the prices pretty attractive.
For the money I like these. Probably the lightest boot with the most support I've ever worn
https://www.rei.com/product/127770/salomon-quest-4d-3-gtx-hiking-boots-mensIf you want all leather I like these.
https://www.rei.com/product/896262/asolo-tps-520-gv-evo-hiking-boots-mens
