I'm right there with ya. The Under Armour is good but for the price I think you can find something just as good but cheaper.
I have never hunted anywhere outside of Tx but my buddy has and he uses wal-mart brand to layer up and then RuggedTUF as his outer layer.
He said he was up north in the cold rain and this stuff worked awesome. He recommended it to me so I went ahead and got myself a set. It has all the bells and whistles like blocks water, stains, odor, and even mosquitoes if you can imagine that- offers more than most of the super pricey stuff but for half the cost.