Lately I've been really into the coral varieties, last year added Coral Charm and Pink Hawaiian Coral. I love all peony colors, but am most fond of bright, rich, saturated colors. This year I've added Blaze, Scarlet Ohara, America, The Mackinac Grand, and Fairy Princess, and have just placed an order for Cheddar Charm, Krinkled White, and Pink Kisses (buy 2, get one free sale from Songsparrow).
Now I'm going to be looking for some pinks that have a lilac or purple cast, and some dark reds.
Sounds like I need to further consider Pink Spritzer and Raspberry Rumba, having only seen close up catalog pics of them, I hadn't thought about how they look as a bush. Do you have any pics of yours?