I love Nic Boas. I have a female that is 2 years old and just over 29 inches. She will breed next season around 36 inches. And she is calm for a NIC.
I also like Hogg Islands. Very nice snakes.
Centrals Are unerated also.
But if you want to get out of the BCIs you could go to a Brazilian rainbow. One of my favorites. Rosey boas are fun also.