SS Amp Preference for DeVore Fidelity Silverbacks

I run my Silverbacks with either a Luxman MQ-88 (colder months) or a Nagra PSA (warmer months). The pre is a Shindo Masseto. I love both of these amps, which expectedly have very different sonic signatures. I am upgrading another system by incorporating the Nagra, so I am in the market for a very good SS amp for my Silverbacks. Hoping to get some recommendations based on actual listening experience with the recommended amp(s) and the Silverbacks (preferably) or other DeVore Fidelity speakers. The amp I choose will necessarily need to run cool to warm, so class A amps are unfortunately not an option for me. As always, thank you in advance for all comments!