Hi, this is my first post of this type as I never considered purchasing a guitar like this before (over 500.00). I am looking at this guitar introduced to me by a friend. It has been owned by a musician who has played with a lot of large names over the years, mostly country. He says it was built by a luthier named Mike Riggs, but I can find no information on the guy or any other guitars he has built. He says it is mostly stock except for the bridgework and pick-ups. It plays really nice and feels good, but even the local shop here says they would have no way of really saying what it is worth since it is a custom build and they don't know who mike Riggs is. Any advice on what to look for on this guitar to try to get some sort of value so I know if I am getting a good deal or not? Thanks for your expert advice.