ditto to another poster. You can't go wrong with the lynch box call.
I played with the yella hammer in bass pro. It has good sound. I've never had a bad knight and hale friction call. I use the ol lady hen with the wood pot and I use their pocket sized slate.
I've used alot of the primos box calls, and liked them also.
Also check out Crossland Game calls (crosslandcalls.com), they make a great box call. I just got one from them last week. They are excellent handmade calls, and I paid less for it than you'll pay formost mass produced box calls(26.00 shipped).