i am running a 500w mono amp to a 350w type r 12", stock deck off a converter and stock fronts. it works nicely. not as well as a full replacement, but it hits hard and deep. ( insert "greg's mom" comment here)
What's with the wise crack about my mom??? Leave her out of this. She never did anything to you, sep turn your ass down. Rejection's a bitch, but come on, be nice. HeHe. (Obviously an INSIDE joke between you and mori that I don't know about.)
Should work nicely, however you will prolly be lacking in the highs after you add that sub. Next step would be to add a nice four channel amp for the four corners.