I used to own a '74 680 E, it was a rough machine. I just bought a 2000 580 sl series 2, What operating differences can I expect? Do you know what the 680 was rated at for Hp.? I haven't got the 580 delivered yet. The unit has no leakes, or no welds and is a very tight machine...6000 hours, I looked at several 580 k series for 15k dollars and they were rusted or junk. I paid 18k for it, how does this sound for those that own or are looking now??? I see several for 30K. I don't think it was a bad deal, jot me a note...hope to hear from some owner/operators...get some contacts for future references..and I can offer the same.....Ross