Pac boots are the way to go. Baffin and Kamik make some rated for minus 100 and I recently bought the Cabelas Trans Alaska 111 boot and so far it has been good but haven't tested it in really cold yet. When picking a pac boot take the pac out of the boot and try it on. That way you can tell if it encompasses your foot properly. I bought a pair that felt like a perfect fit but toes got cold on cold days. I was wearing two pair of socks and sometimes when 30 below I'd put a foot warmer in between the two socks ( as they are not supposed to go directly on skin). Then one day out I got cold toes just wearing a big heavy wool sock and put the warmer in the boot and put my foot in. Couldn't feel it in the boot and thought I must of missed but couldn't find it in the snow. Turns out it was in the boot and there was a space in front of my toes where it was sitting. The space of air was why my toes were getting cold as it was too much area for it to keep warm.
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