Back in the day I recall finding lots of well curated and conveniently packaged ebook collections. Things like Goodreads choice 20XX, top 100 sci-fi of all time, etc. These days I know plenty of places generously providing individual books, but not where to find these nice collections. The ability to browse popular releases would also be nice. Ideally I would avoid needing to setup specialized tools, like readarr. But if something like its list feature simply blows away any other options I'd consider it; whatever gets the best results in the least time.