I went through this in the oilfield during winter nights. I found with base layers follow the size chart for each company. If possible try some on at a store like Cabelas, Academy etc. If you live in DFW, check out Scheels in the Carrollton/Frisco area. That's where I got some of my stuff, well from the locations in ND.
If this is going to be a one time thing, go with Academy's Magellan brand. I'd probably go with mid weight across the board and get 1 set of heavyweight for if it gets really cold and when you are snowmobiling.
Eddie Bauer has some good snow and or ski pants. Some are lined with a fleece type layer. Really like mine.
Definitely get liner socks. REI house brand are decent. Really like the Scheels brand, have had them for 3 years and worn them a lot as everyday socks when wearing boots in the oilfield.
Then go with mid weight merino wool socks. I like Smartwool Ski socks or Darn Tough mid weights.
I like Keen boots. Have a pair that are waterproof. My use, I haven't had to worry about the lack of breathablity during activity. Have heard good things about Skechers Steel toe hikers.
Whatever you do try on if possible. With boots try to buy now and break them in a little.
Also check out the outlet mall locations of North Face, Colombia, and Eddie Bauer.
TAMUG'04 Marine Fisheries.