Krell HTS 7.1 Variations

Could someone with good knowledge of legacy Krell products explain to the the differences between the different HTS 7.1 products? When I look at the units available for sale here, there is a pretty wide range of "price when new" amounts? Are there a lot of different versions of the PP or are people not being consistent when putting in a when-new price?
You can have variations in what people paid when they bought them new... The original MSRP was $8000 if I remember correctly.
Looking to buy a Krell HTS 7.1. Please let me know if you happen to know anyone interested in selling.

Daniel, there's one for sale at a dealer here:
I have a Krell HTS 7.1 for sale. If you are interested email me at