Where I hunt, it is usually damp or raining more days than not, so ALL my calls are waterproof. I'm too rough on all my equipment, so it's a waste for me to buy a custom or handmade call.

I've had good luck with a MAD River Otter call, it's waterproof, doesn't need chalk, and works in a rainstorm. One side is raspy, the other side sounds a little deeper, like a gobbler yelp (for fall turkey). Looks like Cabelas has them on sale right now for $20.99.
http://www.cabelas.com/turkey-calls-...y-call-1.shtml