So many great posts! Really happy to see Acoustat X and Beveridge both mentioned. Electrostatics with direct-drive tube amps made a lasting impression, to the point I have trouble being satisfied with less. And ADS 2030s - I swear those things were bigger than the crates they came in ;-)
I'll add Acoustat Spectra 22s; really, any Acoustats. Such a bargain, flaws and all. I'd add photos, but I'd have to pull them from someone else's pages. I no longer own any.