Depends on when that sun is. From the plant pallete you'd originally chosen and that mention of "sun perennials" I'd assumed a full sun/ partial shade spot. That may still be the case if that sun is mid-day; if it's on either end we change that juniper should become an upright holly ('Centennial Girl' stays to the right height) and 'Jean's Dilly' becomes a Korean boxwood (nice and dwarf AND hardy)...
Scott