Thanks for the feedback fellas...I will most certainly heed everyone's advice and speak with Mr. Paul. Walnut/cedar, poplar/walnut sound very interesting; and persimmon/maple is a combination I would have never thought of, which is precisely why I asked.
While I have an idea of what I think a turkey call should sound like, at the end of the day, if it brings in birds, I'll use whatever works. That's why I'm interested in learning about what other folks have success with.
Thank everyone for replying,
Greg