Hi Mike,
For ocarinas, I recommend sticking to the 12-hole ocarinas.
They are the most widespread, and rightly so for their versatility.
Next, I would recommend the "Alto C" tuning for starters.
It is the most popular range of notes.
The most common material for ocarina is ceramic.
A reliable, quality place to get some good ceramic ocarinas from is here:
www.songbirdocarina.com
A 12-hole Alto C Focalink ocarina is a good place to start.
If you insist on getting a wooden ocarina, my recommendation is Woodsound.
If you scroll down, there are some ebony ocarinas there:
http://www.maparam.kr/index.html?modea=eng
You can also email the maker on gocarina@naver.com to arrange for different woods to be used.
There are many other options, but I've stuck with the few I think are good, reliable choices.
If you want more options based on more preferences, I'll be glad to provide more info.