Succulent recommendations for outdoor planters

Please give me some recommendations for your favorite succulents for these outdoor planters that I just purchased. The 2 larger planters(irrigation drippers optional) at the front entrance are 18" across and on the north side of the house that only receives partial sun. Something bigger and impressive looking, possibly a fireball agave or small tree. I also have 8 smaller planters (no drippers) that are 14" across on the west and south sides of the house that get much more sun. I like the idea of having colorful succulents that hangs down the side.