I advise doing what most Buddleia growers do. Don't try to produce as many cultivars as possible. Pick one or two that will do well for you in each of the basic color categories. This cultivar was named 1991 Perennial Plant of the Year by the Perennial Plant Association. Large crinkled leaves with bronze-purple coloration.
Flowers are off-white.
A Terra Nova 1998 introduction. New growth has a metallic lavender sheen that changes colors somewhat with the seasons. Foliage persists in winter even in cold climates, but should be protected from drying winds. Flowers are chartreuse on tall spikes. Another 1998 Terra Nova introduction.