Don't know which part of Maryland you are in, maybe I didn't read the posts well enough but when it comes to stuff like that I take my car to Oliver's Automotive in Saint Charles/Waldorf. I still have the stock exhaust on my Contour but I had a flowmaster cat-back put on my old Mustang there. They did a great job, charged me around 80 bucks, (that was a while back though), and told me if I ever had any problems just to bring it back. I never did have problems.
Hope this helps... I think I would go with an SVT exhuast if I were you, especially the one that Pete was talking about. But after you get the exhaust, then you will want the body kit, then you'll get rims and lower it, and it all just goes down hill from there.....