I agree the SP-8 is definitely a good model, especially at the used price, an improvement over the SP-6. I have owned both. The SP-10 Mk2 is even better. To tell you the truth, I still love the sound of this pre-amp even compared to new models and would trade my Supratek Syrah for one in a heartbeat, love that phono stage! I have a friend who owns one and no it doesn't have the detail or extension of other pre-amps but it really draws you into the music so you can just forget about the sound. The SP-8 also does this but doesn't quite match the immediacy, depth or bass weight presented by the SP-10.
It is easy to see why there is still interest in these models.
It is easy to see why there is still interest in these models.