Rackmastr,
I am currently in the same quest for cold winter boots with the much needed ankle support.
My pair of polar quest from Lathrop arrived on Wednesday and the Meindl's 800 from Cabelas arrived yesterday. The Meindls are in limited supply (not sure of your shoe size). I normally wear a 10 but went 10 1/2 in the Meindls (great fit for my feet).
I'm going to do some more walking around the house before I make my decision. The early lead is going toward the Meindls.
My original search was for a cold weather boot that would serve me well in keeping my feet warm while on a snow machine but would provide ankle support while chasing Mt. Lions with dogs has ended.
With a tear in my anterior talo-fibular ligament, ankle support is paramount. Without a doubt, the lundhag polar quest boot is a great boot that provides the warmth of a pac boot but the ankle support of a mountaineering boot. However, the meindl 800's edge out the lundhags in ankle support.
If didn't already own a pair of schnee pac boots, I would probably have kept both pairs. The polar quests would be a great stand boot in cold weather.
I usually wear a lorpen merino wool sock without a liner sock. I did order the Meindls 1/2 size larger than my "normal" shoe size.