Red Dragon Bamboo (Fargesia sp. Jiuzhaigou) is hardy in zones 5 through 9. I've been to a local zoo and there is a beautiful pathway planted deeply with Bamboo. It can create a beautiful privacy environment.
Look around. If there's a big swath of color you see thriving in someone else's yard right now, then there's a good chance it's Annual Vinca. With so many colors to choose from and its love for hot, dry and humid climates, the question to ask yourself is "why did I overlook this one?"