The main challenge with winter boots is moisture management. That's the difference between cold feet and warm feet.

Some of my winter hiking boots have a light Thinsulate lining. It works, to a degree. They're good enough for an active half-day trip in temperatures above -20C. I buy them with room for double wool socks and if possible an additional felt footbed. As a rule, I throw in a change of socks too. When I get home, I have to dry everything out.

For serious cold, a removable liner is the only way to go IMO. That allows you to dry out your primary insulation in the field. This can be done carefully by a fire, or even in a sheltered, sunny spot. I just prop my feet up while having tea, wearing both socks and boot liners, and watch the steam come off of them.

I haven't tried the Predator™ Extreme Pac Boots, but based on the link they look pretty good to me.

My $0.02.