Ideas for perennials that will give the most bang for the buck

Where are you located? (Climate zone)
Shrubs:
—Hibiscus. The double hybrids get quite large but they will flower until the cold settles in. Can be killed by a hard freeze but cheap to replant.
—Yesterday, Today, and Tomorrow: white, lavender, purple flowers on the same slow growing bush. Old fashioned plant that lives a long time, pretty hardy
—shi shi gashiro camellias. Can tolerate full sun, ok in partial shade.

Non shrub flowering perennials:
—LA iris or hybrid iris (only bloom spring, tho)
—Shasta daisies (also spring blooming); low plant w/taller flower spikes

Why not consider another rose? Not a dumb hybrid tea or landscape rose (like the knockouts that are everywhere). A so called “old garden rose” is pretty much disease free and indestructible. Best performer in climate 9a/b is a variety called Cramoisi Superior. It will get to be 6 x 8 to 10’ if left unpruned and will flower 12 mos a year. Small to medium dark red blooms. A great old rose.

Early color- spirea
Long lasting color in the heat- lantana. New Gold is compact (for a lantana) and excellent flower power

If you have shade, I like turks cap. It can be a bit spready, but it's one of the few things that will flower well in shade. Hummingbirds love it in September here. It does die back in winter.