I've been using purpleheart as handle wood now for a while and it's great.
Because I never use weight screws in my cues, purpleheart is an ideal option to get cues to the natural weight of 19/21 ounces.
Besides that, it's stable, cheap and very stiff, glues well. It is perfect wood to use when talking about handle/forearm joining.
With BE maple forearm and butt sleeve, purpleheart as a handle could produce a cue with a natural weight of around 19.5/20 ounces...
Ebony is not very stable as handle wood but could be used when cored... The natural weight of a BE maple cue (forearm and buttsleeve) with a full ebony handle would be about 20/20.5 ounces and about 19.5/20 ounces when coring the handle...
Tom Penrose