Aero,
when I make a backed bow, cut my backings from bow wood, ripped on a table saw, and hand sanded smooth. Not very exotic but hell for tough. If I want speed and power I'll use hickory, hard maple and occassionally paper birch. If I want "pretty and color contrast I use the above three plus grey or red elm or white or black ash. I use fully quartersawn for my bows so I just use one of those pieces and rip one up into 1/4 or 1/8 thick strips (still quatersawed).
For what it's worth
Rich