, John! Nice choices on your plumeria picks from Ken! I love the Vera Cruz Rose!
Where are you going to be keeping your plants for the winter (Indoors, greenhouse, etc)? As far as needing quick and simple soil from the store, when I am in a hurry, or if I'm being lazy, I just pick up some cactus, palm, and citrus bag mix from HD or Lowes. Even some walmarts have it. It is fast draining, easy to use, and is sandy. I've never had a plumeria complain about it. It's my favorite "in-a-pinch" soil.