What did you decide?
If I was in your position, I'd go with the snake John1982 has.
Really a no brainer for me when it comes to the Papuan or Aussie olive, as they are possibly the KINGs of all snakes since they will eat anything including other snakes.
I think Argentine boas are pretty cool, but if you want a more active animal, I'd wager the Papuan or Olive are more exciting.
The BCO is a large boa constrictor, but if you are looking for the largest of boa constrictors, the Peruvians from the Iquitos local are not only huge, they are some of the most beautiful boas around.
I had to bring this thread back after seeing John's pictures.
That Papuan is just fantastic!