In the salamander example you gave, scientists do not call them different species. The person who wrote the article seems to think so, but scientists at large have not yet considered them to be different species. So they clearly are not an example of macro-evolution.
As to where I draw the line, I have said it a few times on this thread (though not directly to you): Macro-evolution is a transformation requiring new genes, more complexity and new faculties. In terms of genetics, it requires at a minimum the creation of more than one new gene. In terms of taxonomy it would require an organism to change into a different genus.
As to my reasons for drawing the line there see post#1175.