In reply to:
what would you get for your contour SVT
Decent HU (bypass factory amp) - $150
Tweets and x-overs for front (use stockers for mids, for now) - $40
Efficient 12" sub - $50
4ch amp to run fronts and sub - $75
I'd spend the rest on a
www.knukonceptz.com 4ch amp install kit and box building materials.
In any case, a new HU and factory amp bypass should be your first and foremost.