I would say sorels, i dont know how cold it gets down there though. Ive worn my Military issue bunny boots outside at temps of -10 to -50 for two to three weeks straight and have never had cold feet yet. They dont look very steezy but they work and are hella cheaper than a good set of sorrels. Also Rocky and Bellville make some boots that are very waterproof and have liners. So on days its say 20 degreese or better you take out the liner and just wear the 200g boot, cold days your through the 400g liner in and its very warm adn dry. Its more about socks than anything. Something thats moisture wicking and you need ot be changing them every couple hours. I wear sock liners or just thin ass dress socks when im wearing those boots. And i wear them everyday to work and i am outside at night in the cold a lot. me and my wife were both out at the Dropzone last night ( we both jump out of planes for the army) from like 10:30 pm till about 3 am and had basically the same boots on, i changed my socks at like 1 and she didnt, her feet were freezing. it was only like 15 degreese and i didnt even have my boot liners in. Its all personal prefrence though.
Damn never thought i could talk so much about boots.