I wouldn't buy a pair a Pac Boots today. Buy a pair of tall insulated hiking boots, buy them big enough to put some "toasty toes" or what ever they call them, you know the little packets you can buy, break open, shake and stays warm for like 8 hours.
If you are walking, you won't need them. If you are stand hunting or horse back riding, your feet will stay nice and warm.
I don't wear my sorrels anymore, they are a pain to walk in, and my feet got cold. The only difference between traditional Sorrels and Schnees is the Schnees are tapperd for horse back ridding. With the Variaty of thinsulate, goretex leather boots, I believe them old heavy pac boots with 1/2" felt liners are obsolite.