Oh dear, what a decision. I once saw a peony that was so perfect, so flawless and pure in colour, white with a hint of soft yellow cream and vivd centre that I stood looking at it breathless so peonies have ever since been part of my life. I had a long row of them from snow white to shades of pink to deep red but left them most behind when I moved. Now I go to large public gardens and accessible private gardens to see them. One has the largest collection of peonies in North America. http://www.whistlinggardens.ca.
Second would be daffodils. I loved Wordsworth's poem as a child. I planted a 1/4 bushel of these all around my farm house buildings. DH used to watch for the first bloom each spring and bring it to me in triumph and delight. It is those precious little memories that bring tears to my eyes.