I use a buck gardner call and it seems to do just fine for me. I have not had any trouble with it down below zero. If you keep your calls tucked into your coat you won't have as much problems with them freezing. I think the best thing to do is to go into a decent sporting goods store and try a few out. There are lots of different calls on the market for a reason. You might find that the ten dollar call works very well for you while the 50 dollar call makes you sound horrible. Or it might work out the other way, you just never know. But don't just blindly buy a call.
* (Swinging club) Whack! whack! whack! *
Nope, the old nag's still dead .