Echeverias form those classic rosettes in every shape and color. They're gorgeous potted on their own or tucked into an arrangement.
With hundreds of varieties, Crassulas are some of the most recognizable succulents. The jade plant is the one most people know.
Sedums come in cold-hardy and soft types. Some make such good groundcover you can use them in place of grass when xeriscaping.
Most people know Aloe vera, but this group is full of surprises. You'll find colorful hybrids and giants that can live 100 years or more.