too many to name, though maybe someone else has a favorite. I think it depends on what you want to do. TP's suggestion is best. There is a lot of good info, and resources. This can be a real adventure.
If you want to build a kit, Audionote, Bottlehead and Decware come to mind. I built the Decware kit (low power @ 2 watts or so). If you want to build from scratch, go to diyaudioprojects dot com
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