Honestly if you're just going to be walking around, and going from indoor place to indoor place, get a pair of merrells. I have a pair of goretex insulated ones that cost me all of $89. Basically they're cross trainers with some insulation. I love them for everyday wear. Right now I'm in Chicago where it's 11 degrees, and my feet stay warm with normal socks on my 1/2 hour walk to work.
They're light enough to wear for a 16 hour work day and they don't kill my feet, either.
If you're going to be out in the snow for a few hours, standing in one place, the Merrells aren't exactly the best thing. Get a real pair of boots I've had Danner, Red Wings, and Rockys and have liked them all.