What have you tried?
Have you tried Danner Pronghorns?
How about Kenetrek?
Kenetrek Mens Mountain Extreme 1000 Insulated Hikers # KE-420-1000
Price: $395.95
Quantity:
"Carry all the weight you can stand through below zero temperatures in the most hostile terrain imaginable. The 1000 grams of Thinsulate insulation combined with a Windtex, waterproof, breathable membrane keeps you warm and dry. Slippery vertical terrain meets its match with the firm nylon midsoles, steel shanks, and high traction K-Talon outsoles. Padded tongues, collars, and a firm yet flexible lacing system cradle you in comfort. Triple stitched one piece vamp uppers are made of thick 2.8 mm top grain leather."
Do you use heavy duty Hiking Socks like Smartwool?
If I am hiking, I don't need a ton of insulation. When I am sitting on stand, I use 800 gram Rocky Boots with toe warmers and electric socks.
If I were going to hike in and sit in one spot, I would use 400 gram Pronghorns with heavy socks, toe warmers, and electric socks.
If I had the money, I would go with Kenetrek, but I will stay with Pronhorns for now.
Good luck,
Paul