I broke my exhaust when I drove backwards over some tires at about 60km/h
Money was tight so I replaced it with this;
http://vibrantperformance.com/catalog/product_info.php?cPath=1021_1031_1053_1110&products_id=28
$100 cheap and it sounds good, a little more throaty than stock but not annyoying or Ricey. Just add a nice tip and you are good to go. NO WAY I would spend $500 on an exhaust.
I would replace the shocks with some Konis. You will be shocked at what it will do for your car.