Boas can get huge.
A female BCC can give you the big snake feel but with the boa temperament.
Check out this male Peruvian BCC. Yep,,, I said male!!
This is a 14 year old snake.
http://www.mccarthyboas.com/BS_5_201...t_60LBS_02.jpg
Just in case you are not quite ready for the retics just yet.