rhino is a good cheap one as well
I have Rhino and madCam. I very much like Rhino for guitar work, because it's really quite adept at working with all sorts of organic shapes. It would be very cool for inlay work. It's also easy to program and make custom scripts for automating tasks. That said, it forces you to think about your models differently, starting with very simple lines and shapes and then using the various commands to flesh out the surfaces. You'll quickly learn how advantageous it is to think about a cone, for example, as a slanted straight line rotated about an axis as opposed to using a cone primitive.
Go to
www.infiniteskills.com. Get a monthly subscription. It's cheap. You can cancel it and reactivate it when you need it again. They have tutorials for AutoCad, Solidworks, Sketchup, and Rhino, plus they have LOTS of other tutorials on practically any software you could want. I can tell you that the Rhino tutorials are top notch. I went from zero to quite competent in just a couple of weeks. Ditto for the tutorials I've done for Photoshop, Premiere...probably some others. Oh, web design...lots of great stuff out there.