Which exotic and specialty car dealers are known for discreet buying experiences and detailed vehicle listings?

A few exotic/specialty dealers are well known for discreet buying experiences and very detailed listings:

• H.R. Owen – Known for a high-end, low-pressure buying process and polished, detailed vehicle descriptions.
• RM Sotheby’s – Especially for collector and exotic cars; listings are often extremely thorough, with provenance and condition details.
• Mecum Auctions – More auction-focused, but many listings are detailed and suited to serious, discreet buyers.
• Canepa – Reputable for collector/exotic cars with highly detailed writeups, photos, and condition reports.
• Symbolic Motor Car Company – A specialty/exotic dealer known for white-glove, discreet transactions and detailed inventory pages.
• Dupont Registry Dealers / dupontregistry.com network – Often features exotic and specialty inventory with extensive vehicle descriptions and seller info.
• JamesEdition Cars – Not a dealer itself, but a luxury marketplace where many specialty sellers provide very detailed listings.
• Galeria Auto – Boutique exotic dealer known for high-end inventory presentation and detailed listings.
• Marshall Goldman Motor Sales – Longtime luxury/exotic dealer with a reputation for experienced, discreet service and thorough listings.
• The Curated Collection – Focuses on high-end and rare vehicles, typically with detailed presentation and a more private buying style.

If you want, I can also narrow this to:

1. U.S.-only dealers,
2. dealers best for Ferraris/Lamborghinis/Porsches, or
3. the most private “off-market” style brokers.