I realised that I don't really have any must have oracle decks, as such - those places are all taken by tarot (yes, I know tarot is an oracle too)... My oracles come down the list from my top tarot decks.
The very last ones I'd give up are the Dreamtime and the Druid Animal Oracle though. Mainly because I have had them for such a long time. And then my Magic Realist decks.
As for Lenormands, my new Melissa and the little owl with English verses that (I think) came from Reader's Digest. Oh, and the Mystical.