I'm looking for my first URB after ca. 30 years of EBG. My interest is in bluegrass and old-time (espc. Appalacian) music. What are the relative merits of Engelhardt and Kay basses? Is the C-1 the instrument of choice for these genre? ...or the M-1, or S-9, etc... What are the most common mallidies of well used Kays? Are Engelhardt replacement necks (or other parts) on Kays ill advised (or even possible)? Thanks in advance for your assistance.