Premium Retailer/Auction House Recommendations

Hi everyone. I have a decent collection of wine and am looking to continue investing ~$100k in the next few years in a collection. Emphasis on the classics, but I love recommendations from the right people. My question is, does anyone have a retailer/auction house they love working with? Maybe a person you work with 1:1 that is awesome? Many thanks!

Edit: I am Los Angeles based but an open to working with anyone in the US.