Trace Genetics at http://www.tracegenetics.com is known to have a large database of Native American DNA to test against. That might be a consideration if you have Central American Amerind ancestry.

Any ofther ancestry should be picked up as either Asian, European or African. http://www.AfricanAncestry.com is one company known to have a large database of African samples for comparison.

Take a look at what the various companies specialize in while offering to test anyone. They also collaborate and may test against another company's specialized database.

toot