I would have to agree with 4est cause you can work with a bit of wiggle here and there by getting creative with heat, but thin rings can dupe most new bowyers. Ring chasing has always came easy for me even the ultra thin ones, but it's very tedious work. Kinda like going to the DMV, you better bring a good book and something to drink cause it's gonna be awhile!
I've also only found a small handful of what I consider "perfect" or near perfect osage staves. They all have some bow to them left/right up/down or a bit of twist. Only had one natural split stave that was board straight and even it developed a bit of twist during the tillering process that I had to take out with some gentle heating.
Bottom line, osage or hackberry would be a great choice of wood with the nod going to osage for beauty, forgiveness, and ease of use.