Good call!
What is legal in your area and what is not?
Does the permit allow you the snakes you'd like to keep?
There are a lot of great species out there and some don't fall under regulations.
IF,,, and this is a big if; The Lacey Act sticks here with the Anacondas, Burms and Retics, I feel there are some other species that can fill the void.
I almost hate to name them because of "big brother", but Olive pythons and Scrubbies are often overlooked.
I am not a true giant snake owner even with a coastal carpet and Colombian locality BCI, but if I was looking to get into something bigger and not able to go Burmese or Retic, I'd look to the Aussie pythons.
The scrubs are highly arboreal and very exciting and challenging too.