Well, first off. Pick a topic that you like. Especially one you feel strongly about. This will make writing your paper easier. Because I don't know you personally I don't feel like I can suggest a topic for you. But my advice on the picking a topic should help a little.
If you have more questions about writing an argumentative paper just let me know. Those types of papers are my specialty.
"And somewhere in the northwoods darkness a creature walks upright. And the best advice you may ever get is: Don't go out at night..."