SS amp does not require a SS preamp. In fact many folks like to couple a tube preamp with a SS amp. You just have mind the impedance mismatches. It would appear that you would be fine with a preamp with an output impedance under 1K.
That said, looking for a >$500 preamp to mate with that much more expensive amp would seem a bit strange to me. I think your only option would be to go with some passive attenuators.
Other options would include, look for a digital source with volume control to replace your current one, or look for a integrated amp to replace your Bryston amp.
I do agree with mesch, I find the preamp the heart of the system. For me, finding the right preamp can be more difficult than finding the right speakers.
That said, looking for a >$500 preamp to mate with that much more expensive amp would seem a bit strange to me. I think your only option would be to go with some passive attenuators.
Other options would include, look for a digital source with volume control to replace your current one, or look for a integrated amp to replace your Bryston amp.
I do agree with mesch, I find the preamp the heart of the system. For me, finding the right preamp can be more difficult than finding the right speakers.