Lee,
If twisting is a possibility after splitting (or sawing), you may want to clamp it down to a 2x4 or something to help keep it from going snakey. Might save you some straightening down the line.
I recently had a chokecherry stave about that size that I roughed out after a couple months of drying. It was perfectly straight at the time, but as it continued to dry, it hooked in the handle area and one of the tips, and took about 2 1/2 inches of reflex (thankfully no prop twist). I wish now that I had clamped it while it dried.