hmm engraved? uh what type of guitar is it? what is the color of the pickguard? what color would you want engraved? and finally, what is it going to say?
i personally think that it's a great idea to do on a les paul, but come up with your own saying, keep it original with your OWN saying not bono's The Goal is Soul...or "i feel good" (the saying on the bottom of bono's black guitar he played on Zoo TV)