Sounds like a question you should ask the manufacturer, he is very accessible and welcomes these type of injuries, he was certainly helpful in a similar decision I was in need of making.
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I heard a pair of M60s many years back, can't really comment with any meaningful comparison with the later Silver 88, compatable with the kt150 tubes and what I currently use. The Silver 88 is a most exceptional amp with nada a one irritant that fatigues over time. I never heard a Quicksilver I didn't like. They really are an amazing value in tube amplification.
I agree with tooblue, give Mike Sanders a call. He is direct and a no bs guy. He'll give you his honest opinion.
I agree they are great amps... I have been listening to a set of m-60 with Tung Sol 6550, Vandersteen 2ce sig ii and an Atma-sphere UV-1 point to point and it’s not just music... It’s an experience..... Wished Mike had a Minnesota or Wisconsin Dealer.... Value wise hard to beat... But I have listened to a Atma-sphere m60 briefly and that also was incredible....