Yes, the Frankensteins are sadly gone. They didn't match well with the Pendragons, but they would be an ideal match with the new Definitions' nano drivers. You are spot on and I've been on the lookout. The warmth of the 300b would be IMO ideal. Having said that, the PX-25 is very nice and paired with my current system, I have a very nice, musical presentation with a very wide and deep and holographic soundstage. A little more warmth is the vocal range and I would be very happy!