Ditto on what monoblocknova said. Been running my Salon 2s with Symphonic Line Kraft 250 monos and SL Erleuchtung tube preamp for over ten years and added the SL Belcanto CDP with optional DAC in 2015 - and have seen zero need to change them.
Reach out to Symphonic Line importer Klaus Bunge of Odyssey Audio - he often knows about used gear that might be available in addition to the new stuff.