What do you like for a cold-weather wax? I use either Swix Universal or the Hot Sauce, but I need a wax for those really cold, low moisture days. I like to keep things simple and cheap, but people keep telling me the only waxes that really work all that well for those conditions are expensive waxes with fancy additives like graphite and moly. I'll dish out for specialized wax if that's indeed true but I thought I'd get some feedback here first.