Compared to so many other cars, we don't have all that many options to choose from (or regret), which is great!
For the money, I'm pretty happy with what I got stock. Exhaust would use an upgrade no matter what, but it's not like you can do that from the dealer.
If I had anything to add, it would be that I wish I had bought it gently used and not new, but that's a budget thing, not a car thing. Maybe a new head unit so that I can tell both the song AND artist when an XM tune is playing...and cleaner ipod access.
If you're the kind of person who replaces stuff on the car, you probably would wish you hadn't gotten whatever you replace. But that's on you.