My unobtainium is probably S2 of Code Monkeys (never got a DVD release), maybe Xavier Renegade Angel, or maybe some of the lost media that only exist as VHS rips.
As far as bad copies, I have controls enabled to prevent downloads before official Blu-ray release dates for new movies and since everything pulled in gets transcoded automatically on the driver patched 1050ti to unlock the NVENC encoders, things are generally similar in quality. When there are bad gets, sonarr/radarr have web UIs that make it pretty easy to search all the indexers for particular episodes to overwrite the local copy