I highly recommend going through a reputable breeder whether you choose a BCA or BCI, but especially for a BCA. Amarali are harder to find and you'll want a pure locality. It is much easier to find a nice BCI, but well worth the trouble for a quality BCA.
The babies look different from adults. What you see is not generally what you'll get in an adult. Baby colors are usually much brighter with more contrast than adults. You've seen the pic of my Sao Paulo baby above. Here are pics of his parents....
You can see how much darker they are from my baby. My baby still has a silver overtone and his tail saddles are still dark red. The silver changes to a more pewter/charcoal color and the red gives way to a more black appearance. This is typical of BCA. And the Sao Paulo are a particularly dark locality. The South Brazilians and Bolivians are lighter as adults.
Colombian BCI colors usually behave similarly, however, since they are generally lighter and more colorful than BCA, the adults are usually a bit more colorful too:
This is a baby normal Cherry Pastel BCI
This is her father, an adult male normal Cherry Pastel BCI
And, while I don't have a baby pic to compare with her, here is my adult female het leopard. You can see how colorful she still is.
It's important to note that these BCI pictured are morphs. They are not "normal wild type". The Cherry Pastel gene and the leopard gene affect color and pattern even in an otherwise "normal" BCI. But I think you should be able to see my point.
** What breeder were you considering for a BCA?? In my personal opinion, the only 2 I would work with (for BCA) are Vin Russo and Legacy Reptiles.....