My experience would say to price a new prop. iBoats and others have good prop selector tools. A rebuild on my 14.25 x 21P aluminum prop is about the same as a new prop, assuming I own the hub kit. A new pressed-in hub prop, like Michigan Wheel may be a wash with a rebuild. And I've known very good, and very shady rebuilders. A new prop is always good...until you whack it.