Agreed with gangster. It all comes down to quality whether they are cb or wc. But generally, wc fish are supposed to have better genetics and color. I'd pick up a quality cb bass anyday. Rio araguaias have been bred only in Asia and are plentiful there. I know that aquascapes has brought in araguaia kelberis in before but I'm not sure if they were cb from asia or wc. In general you won't find cb araguaias here in the states unless someone has imported them from asia. For wc, I believe discus has brought in one of the very first wc araguaia kelberi batches into the states. I hope that this fall they will be available again.
Are you trading your armatus? I'd say it's an awesome trade so go for it. You don't see wild caught kelberis everyday. Personally, I don't like bahias but that's just me so you are one lucky fellow to own wild caught araguaia kelberis.