Also, be advised that many of the principle players at Spectron have passed away, so I'm not sure about the long-term viability of the company.
When moving off Spectron, I auditioned a number of great amps, including the Sanders Magtech. Roger was a fountain of knowledge, and he provides a risk-free trial, so you can't really go wrong.
That said... I didn't like the Magtech much, and wound up returning it. I bought a Rowland Continuum S2 integrated, and really couldn't be happier about the choice.