I went down to the local "wood turning" market today to check it out.
There was an old guy there with some really nice bits of timber, but not sized right for handles.
One in particular which he called "hairy oak" took my fancy.
It is apparently a western regions timber and has small dark (black) lines running through it.
I ended up paying $25 for a piece of cedar and a piece of camphor laurel (that bloody hurt - it's a weed where I grew up).
It'd be nice to know where you can get some nicely figured and dense timbers for fancy grips.
I found these pics of some pens made from hairy oak.