Hey,
A nice bit of maple could work there I think, maybe even ash or alder for the lighter match up. Then again, Ebony, whilst you may want to steer away from, it'd match up nicely.
Check out the Nordstrand basses, the custom jobbies... i'm pretty sure they've done some sweet ramp jobs. If i'm wrong, then you can probably get some great ideas for wood combos as he uses some wicked woods!
Thanks
Jamie