A lot of brands make at least one boot in their lineup that will work for you. I have a buddy who wears 31s and he's a Nordica boot guy and has been for awhile because they fit him best, I do recall him saying the Rossi Alias boots fit him well too. Best bet is like these guys suggested, try them on in a shop and see what fits you best. Don't go into it set on one set of boots, once you figure out what boots fit you best then you can get more picky about models/flex.