I have an all original 1970 Fender P-bass but to me the pickup sounds thin, lacks low end and has a pretty low output. It has a trebly aggressive tone instead of the warm bassey tone I get from my 2003 American P with a '62 reissue pickup. I've been thinking about swapping the pickup out for something with more output that still maintains a somewhat vintage voicing. Anyone have any good suggestions? I've heard good things about Fralins and the GZR pickup. Also how much will swapping the pickup affect the resale value of the vintage bass?