After reading the thread so far, I think there might be some confusion. First off, I assume by boa, you are talking about the genus Boa, which includes a number of subspecies and even greater number of locales and an even greater number of morphs. All, the same species though.

Now, Red-Tailed boas in culture (we are talking the breeders who work with them here) are of the subspecies Boa constrictor constrictor. Generally it is not suggested to start with this subspecies, they are not fogiving to mistakes in husbandry, get fairly large, and and not as easy to breed (though you mention looking for a pet).

I saw you asked about Colombians Vs. Colombian Red Tails. If you walked into a pet store and they had a boa constrictor for sale I'd be willing to bet the label on the cage said Red-tail boa. Likely however it is either a Nicaraguan (the most common locale out of Central America) or Colombian B.c.imperator.
"Red-tail" sells better than "constrictor." Just marketing, but also false information. While MANY Colombians do have red tails, they are not Red-tails. There are SOME Colombian B.c.constrictor but they are very rare and will be accompanied by lots of records to prove their origin (and scale counts give it away).

Males are generally smaller than females, though some girls may just have genes that they don't grow as large at males from other bloodlines.

I'd suggest you consider any CBB locale of B.c.imperator or BCI, to start. There are a lot of natural phenotypes and a great number of morphs to choose from. There are pure blooded animals, or crosses that might suit your preference.
Some to consider, that are available fairly often are:
Hog Island
Cay Caulker
Nicaraguan
Honduran
Colombian
Sonoran
Some others that fall to the rare end of the spectrum, at least for pure stock are:
Crawl Cay
Panamanian
Costa Rican (Western and Eastern phases differ in appearance)
Corn Island
Tarahumara Mt.
Cancun
Mexican (I've listed three specific locales, but Mexican in general).

A good site for information on most of these locales is RioBravoReptiles.com

If you find some that you like more than others, post a question about them, someone here will usually help you out and post pictures of the animals they have of that type.

Good luck!
Roatan Island

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