Mapman, I had an Audio Research SP15, which I really liked a lot, but I had a hankering, to go the Spectral route and I have never regretted it. I originally, had the SP-12, which I liked, but when the occasion arose to get an SP-20, with built-in phono board, I took it and have never looked back. Fast, clean, detailed and truly realistic ambiance on both instruments and voices. But, like all things audio, it is a personal preference.
Good luck!
AEW
Good luck!
AEW