I 've always liked the OC6 since I saw one at an Auction when I was about 12 . 
I always peak interest when I see one for sale.  I see some nice ones and some junks. I 'm very astonisheccd by the price they ask for them . I think one that is running moves good track is 2500 to 3000 , but I see them ask 4500 for ones in the weed s for 40 years no way.