Agree...good stuff. I've just got the Cold Gear Evolution mock tee and it's perfect every time. Comfortable especially under other layers, warm, and dry. I wear it for packer games, ice fishing, hunting, and more. I'm not a fan of stuff tight on my legs, but I'm looking into a pair of the bottoms for stuff like ice fishing or other cold.
I have some of the "off brand" stuff too....the Gander Mt equivalent, and some cheaper tek something workout type gear top and they work very similar. Nike, Adidas, Reebok, and other off brands all have something like it these days, and it all works pretty well.
Those other UA options...if you look at the construction of the Evolution vs the 2.0 vs the 2.5 etc....they are basically the same stuff material and % wise, just cut a little different or in different colors.