For me, for electronics, it has to be the Meitner PA-6i/MTR-101 combination, last manufactured in the early 1990s, but still serviced and upgraded by Museatex (www.museatex.com). I've had this pre-power set in my main system for seven years. I keep bringing in other amps and preamps, some much more expensive, that I hope will improve upon them, but none has yet displaced them.
For sources, it would be the venerable Technics SP-10MKII turntable, preferably mounted, not on the beautiful "obsidian" plinths that Technics made, but on a 20-30 kg DIY composite plinth of Corian, birch plywood, and MDF.
My speaker mega-favorite is the Tannoy System 15 DMT II: when I think these come as cheap as $1500-1800 on the used market (though prices appear to be rising), I'm absolutely gob-smacked.