Layer, Layer, Layer. I was in VA last weekend and we had a high of 32 from Thursday night - Sunday night. It was usually between 20-25 when we were on stand and icing/sleeting part of the time. I only spend real $$$ on two things. My base and outer layers. Scentlock/Scentblocker etc on both. The rest I just wear whatever I've got because I have a ton of warm clothing. I'll layer based on expected temps and sometimes if I am going to be in the firetower stands on the property, I'll pack an extra or leave room for an extra layer to take off and put in my bag.
Upper Body:
Thermal Base Layer - UA Scentlock or something similar
Long sleeve tshirt of some sort
Windstopper jacket - Mountain Hardwear
Hoodie
ScentBlocker shell jacket
Lower Body:
Thermal Base Layer
Fleece Lined Jeans or Carrharts
ScentBlocker shell pants
If its really cold I'll throw on some Coveralls instead of my shells, but I haven't yet this year.
My boots are some obnoxiously warm high Thinsulate count Irish Setters's (water/scent proof) I got from Mo's in Boone on closeout a few years back and I rock those with a pair of good SmartWool socks. Really, keeping the extremities warm (head, hands, feet) goes a long way to keeping the rest of you warm. I am not very brand loyal when it comes to outerwear. If it functions and has the features I am looking for at the right price, I will get it. I think most of my stuff right now is Gander Mtn's house brand stuff since I had some coupons when I re-did my outerwear last year.