I stuck in 4 Sony Xplod 3 ways in my doors when I bought my SVT, and it only cost $105 with shipping off of ebay. Also picked up a $30 dollar 10" pinoeer sub and had a 160 watt JVC deck already (~$50 off of eBay right now). If you run the door speakers off the amp and use the head unit for the sub, you get a system that sounds nice, isn't overly excessive, and is around $200 (you'll need a box for the sub). Well, good luck with your problem!

I ran a search already! 99 Ford Contour SVT - SOLD!! '90 CRX Si, '98 Explorer V8, '98 Acura ITRally Co-Driver