Once I discover a plant that I like, the "collector" part of my personality takes over and I want as many cultivars of it as I can find. Too bad there aren't unlimited funds LOL. Anyway, two of the plants mentioned - Japanese anemones and Toad Lilies fall in that category for me. I like them because they do well in my shade garden and add late season blooms.
For Japanese Anemones, I now have 'Queen Charlotte', 'Mont Rose', 'Rosenschale', 'Serenade', 'Pretty Lady Emily', 'Pretty Lady Julia', 'September Charm', and 'Pamina'
For Toad Lilies, I now have 'Amethystina', 'Dark Beauty', 'Empress', 'Lightning Strike', 'Samurai', 'Blackberry Mousse', 'Blue Wonder', 'Miyazaki', 'Moonlight', and 'Sinonome'
To add my two cents in for Plant Lust, I have it bad
What first comes to mind for things on the must find list are 'Okame' cherry trees, and now my thoughts are running amuck with visions of roses. I first saw a mature 'Okame' cherry tree in full bloom at the Philadelphia Flower Show many, many years ago and it has stayed on my mind ever since. The roses are a new obsession. I don't have any yet, but will be making plans for a rose garden as one of my winter arm chair gardening research projects.