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I'm a fan of maple. It sands nice and smooth, looks good without staining, easy to finish and it's stiff.
I've got little experience with bass guitars. I do know they're a bit longer than your standard guitar scale and have much chunkier strings. I've never tested to see what a maple neck can handle before bowing or warping, but I feel you might need some internal support for your neck. If it doesn't bend off the bat, it probably will eventually. If you're willing to spend some cash, you could put a few carbon rods in the neck. If you wanna Macgyver it, a square steel rod from a hardware store would probably suffice.