$8k is still a serious outlay of cash, so it would be a good idea to do some homework. If you are not already an audiogon Bluebook member, you can join audiogon and purchase their online bluebook option - I think it's around $45. Then you can check prices and the selling history of each item to help determine if you are getting a good deal. More importantly, if you live near the guy, pay him a visit so you can inspect the condition of the gear, and do some serious listening to make sure his system pleases you. This is an unusual system setup. It certainly has components with some very good brands and track records. I didn't know Classe made tube amplifiers.
This has the potential of being a really great deal, but there is also the potential to be very disappointed.
Good luck!