Does it have to be in the 6' range? Or could it be smaller, perhaps? I was thinking about the Hogg Island Boas, though I don't know if those come in albino. They're pretty pale in comparison to the normal BCI, though. One of these days I will have a Hogg. Oh yes...I will.

But I digress....

A male BCI definitely fits into the description you gave, too. And they are such sweet snakes.