I usually buy a variety of things, depending on what's on sale, or what the local corner liquor store has when we walk there, which I figure is Mustachian, so whatever we buy is good. :) My favorites are Stella Artois, Hoegaarden, and Heineken. My husband likes IPAs and darker beers but he usually gets local stuff--there are a surprising number of breweries in Minnesota. But none of these are particularly cheap.
If I'm trying to be economical, I will buy Rolling Rock. I like to put lemon in my beer, though. Leinenkugel is good, too. I don't know if that would be considered Mustachian, but it's usually not too expensive.
It's very rare that we buy beer in cans--I don't know why, but I think it's because my husband got me interested in beer and he prefers bottles, so now I do, too.