Larry,
I do the same thing in late winter and early spring...start thinking about how good a flower bed would look [insert spot here].
It gets easier to cull some iffy daylilies when you get newer ones that just look and perform better. I'm not speaking of new intros since I don't buy them when they're so expensive, just new to your garden. I have been much better about looking for daylilies that have similar bloom traits, but choosing to keep the one with the best plant habits (especially if they have higher bud counts or rebloom, as those really add color for a longer period of time). I see lots of people add lilies in their DL beds to help add color. I don't have those, but do use the sun coleus as mentioned previously as well as dahlias. They are perennials also and easy to maintain within the DL beds.
I can always rationalize the purchase of a flower