Hard to say if $14K is unreasonable without knowing the size of the roof, pitch, height, etc. and also knowing the details of what they are proposing. Agree with roof_lover in general. $14K in Southern California, probably not that big of a roof would be my guess. Labor wise, I'd rather put on a whole new roof versus the material handling in removing, storing/preserving and reinstalling those old materials. How do you account for how many are cracked or will be broken due to mishandling?
Again, depending on a number of factors, I'd look to see if the repair could be done assuming everything else seems to be in good shape. If that doesn't work, I'd consider a complete roof replacement. You could go back with a cement covered steel like Arrowline or possibly better yet, a synthetic composite material like Brava Tile. Depending on where you're at in Southern CA and how large the house is, this is a half million on up property. Spending $25K for a new roof on that property is an easier consideration than for the same roof in a rural area of Kentucky.