I have a pair of Muck Arctic Extreme. They aren't enough. Even with toe warmers, I can't feel my feet after 3 hours. Looks like I need MM boots.
I would pack em in and put them on when you get too where you'll be on stand....
Icebreaker has some sales going. I wore their merino base layers exclusively this year. Damn good stuff. Beats UA any day of the week.
Micky mouse boots are the shit. I was pulling guard once on a stupid mountain in Korea when it was -30 out. Between the Micky mouse boots and teddy bear suit I was quite comfortable. Not very mobile but you really don't have to be when you're just standing in a hole. Lol.
I will second the "bear suit"...I just couldn't get the bibs in the right size from ebay.