Wow, this thread is a mess. The rear overhang on a sedan is nearly a foot longer than that of a hatchback, the exhaust systems are not cross-compatible. Don't buy eBay exhaust, it is a complete waste of time. If you ever just take someone's word on anything, let it be this. Please.
Here's an informative link that does a pretty decent job of outlining the options you have. My suggestion (and a strong one at that) is FSWerks. Keep in mind, it is my opinion that TruBendz exhaust (especially for a daily driver in the rust belt) is garbage. The fit is frustrating at best on most cars, and the stainless used is cheap and thin. Don't just buy something now to have it, deal with your old system until you can afford something that is worth replacing it with.
http://forums.focaljet.com/duratec-...-back-exhaust-systems-your-duratec-focus.html
Exhaust is kind of my thing, so if you have any questions, feel free to contact me on FocalJet, as I am never, ever on this forum. My username over there is "cobrawannabe", I am a moderator in the Duratec section.
Here's a post that backs up my claims of being an "exhaust guy"...
http://www.focusfanatics.com/forum/showpost.php?p=5277322&postcount=170