If you are thinking about the ST70, I would recommend Will Vincent ST70. Built with upgrades parts, you will have power to spare. It will make your Cornwalls sing IMHO I am really enjoying mine on my Klipsch speakers. Another option is Inspire by Dennis Had Universal Amp . Both amps show up used not that often though. I have no patience I bought new. Although I am very new to tubes and no expert. I believe my S.S amp days are over. You owe it to yourself IMHO to try out tube amps
Rich