Becky: I think you should definitely give it a try in-ground! You are quite a ways south of me in Sebastian so I'm sure they will do fine there as I've even seen a few large ones here in Daytona Beach that have survived our occasional cold winters. I have two B. recurvata that I've talked about planting out for a few years now which I still haven't done ... maybe this spring I'll get around to it. Here's the database link for Ponytail Palm (Beaucarnea recurvata)
~ I'm an old gal who still loves playing in the dirt!
~ Playing in the dirt is my therapy ... and I'm in therapy a lot!