Is price of materials a high priority? My experience with golfers tells me that If I save enough kidney stones and am able to build a club face with them, I'll be turning down customers
. The golf fanatic will buy anything that is different.
In that vein of thinking, I would recommend turning out a few made of Kauri. It's now available, stateside:Ancient Wood
If price is a priority, quartersawn Oak might do it. Walnut or Hickory might be good, also. If your tooling can handle it, Ironwood is about the toughest.