I got the minus 33 mid weight a couple years ago and the heavyweight this summer.

Ullfrotte is a great product, worth the price.  I would get the 200 for a base layer.... you can wear it all week and it has little smell, not so with polypropylene.  I have usually buy a heavier 400 top for colder weather and then just some lightweight/medium pants and top over.... (Cabelas Microtex,etc).  I also hunt in Texas so it's not usually too cold.   I have not tried the Under Armour but it would take a lot for me to switch from merino wool....good luck.

KUIU