HI all I have been offered a 18" zildjian bop ride.I have quite a large collection of Zildjian cymbals and i have heard of the bop ride but have not acquired one yet.I have been told by the seller the cymbal has the bop ink stamp. would this be a must for a zildjian freak or should i let it go?If someone could describe the sound and tell me the age that would be helpfull and of course how much should i offer him for it? Thanking all Martin