Hey Tim,
The thing to think about is whatever woods you try need to have the "springiness" to recover from paradox quickly in order to be as accurate as possible.
There are a lot of dense woods around that might make a heavy shaft but shoot poorly because they recover slowly, or not at all (this is what Don is saying). I have seen some experimental shafts actually take a set after the first half dozen shots.
Outside the traditional softwoods for shaft making (POC, DF, spruce, etc.), any hardwood that makes a good bow could make a good arrow (ash, hickory, elm, maple).
I have alway wanted to try and make a dozen osage orange arrow shafts. To fairly match weight and deflection of some of my other heavy arrows I bet they would be as thin as carbons. I just haven't been able to dedicate good bow wood to anything but a good bow.
Good luck on your search.
OkKeith