How Many Times Can I Rearrange the Shade Garden?

The shade garden by my front walk has been bothering me ever since the last time I rearranged it. There were too many gaps, especially in winter. This is a bed that has to look good twelve months of the year, because it's at the front of the house and I walk right past it on the way to and from the front door. Lately, every time I've walked past, I said, "I need to do something about this bed."

The main problem was that the gumpo azaleas are shorter than the hellebores, and you couldn't see them, so I pulled all of the azaleas to the edge of the bed, moved the birdbath, leaving the hellebores further back. Behind them are the taller bear-claw hellebores, then a camellia which hasn't done well anywhere else in the yard, so I'm trying it here.Because I consolidated the hellebores which were scattered all over the bed, I now have a big empty space that I need to fill. I'd like to try some new plants, and I'm open to suggestions for what might look good here. I'd like something that is drought tolerant, and that can handle the dry shade beneath dogwoods. (It's full/partial shade except winter and early spring.) Here's a list of some plants I'm considering. If you've had experience, good or bad, with these, please let me know...or if you have other suggestions. Mostly I want short plants, 1-2 feet tall. Thanks in advance!

Spotted Dead Nettle
Epimedium (Barrenwort)
Lady's Mantle (Alchemilla)
Heuchera
Euphorbia 'Helena'
Winter Daphne