Shawn,
There are Dwarf plumies that only get about 6ft tall, and there are compact and semi compact. Ones that are leggy can get really tall like Aztec Gold, India, Miami Rose, etc.

So depending on what you are looking for you might want to see what kind of growth habit the plant has.

A standard plumeria will grow about a foot per year. In a large pot the growth will slow down at about 7-9 feet. By pruning you can keep a plant at any designated height, but pruning usually results in the loss of one season of flowers unless the pruning is staggared. Eventually you will need to root prune your plants as they will become quite root bound but this is relatively easy.

Bill - I know I have 2 plumarias in large pots that definately need to be root pruned this year. They are just barely starting to wake up. When and how should I root prune? Will they stay in the same pot when finished?

RA in SC

Take a keyhole saw and cut around the inside of your pot about two inches from the edge so the saw is straight up and down. With a large spoon, remove the two inches of soil. Grab the stem and slide the remaining root ball out of the pot and cut two inches off the bottom. Empty the pot. Put new soil mix in the bottom of the pot (about 2") and arrange the old root ball so it stands as you want. Now fill in the soil around the outside of the root ball. The best time is during the dormant period. Bill