To determine the length of the pot; it's generally about 2/3 the length of the trunk.
I personally like shallow, oval pots, for ficus. Creame and light blues are nice colors for glazed pots. Reds will accent the bark when its wet, and the new growth comes in red also. Red pots are hard to find though. Unglazed pots also look nice on these trees too. Just keep in mind, angular edges indicates a masculine pot, while smooth edges indicate feminine. I personally think the tree is trying to be feminine but needs a make over. I got chastised for calling one of my trees a hermaphrodite, on my blog, by a user here, so ya....
To improve your nebari, you should consider splitting and carving some of those thick roots to make them look more ramified. Putting it into a much shallower pot will also cause the roots to grow more laterally and ramify, another reason to go with a shallow pot beyond the visual look.
P.S.
You are probably going to find some thick chunky roots in the current pot. I mean, roots that are over an inch thick going straight down. Which can mean a few things.
A] You will find a larger spread than you though the tree had. At which point, chopping the top out and creating a shohin may be a route you may want to go. Root the top of course.
B] You will be thrilled to propagate these root cuttings.
C] You'll just saw right through them to fit the tree into a more shallow pot.
Or you may not, just remember, you live in Florida, you can remove every single root on that tree and it will be booming right back in 6 weeks. This is a Ficus, it will love you for cutting its roots off. Trust me.
