My understanding is the consensus is "AmerInd" or "American Indian" is appropriate. "Native American" and "Aboriginal American" are PC terms invented by white guilt.
In this case, the former. Like I said, pet peeve. People who use memory to mean hard drive annoy me to the point of distraction. So since you aren't paying me to listen, I get to point out you're a dumbass. Send me a retainer, and I'll stop picking nits.