Joe, you are asking a most perplexing and difficult question. If you must scale back, do away with the blemished machines vis a vis sell them and keep the museum quality ones for display and enjoyment. The "noisier" vintage machines are far better than the knock offs IMOA. I agree that harp length is important, but history is important too. I'm actually focusing on the very old ones now which was always my intent in collecting. Good luck with your decision.