New to Region-Free, What Are Some Must Own Titles?

[DeusExMacarena]

I apologize if this isn't the right place for this topic.

I just recently purchased an LG 4K region free player from 220 Electronics. As I dip my feet into the giant pool of non-Region A blu-rays, I'm curious about some of the best, must own titles I should be on the look out for from the boutique labels based in Europe, Australia, etc. and the best places that I, an American, can purchase them. Preferably looking for titles that have not been released stateside, or titles that have vastly inferior US releases. What would you recommend? I'm open to all genres, but like to focus on horror, cult, and Hong Kong cinema (88 Films comes to mind).

Thank you!