If you are keeping the car I would always go for a dealer exhaust, its worth well worth the money. quik fit ones don't last very long and usually don't fit properly.
Exhausts can be well sealed and look solid enough, but actually be quite weak after a knock. You often find if one of the rear boxes rust through or crack, and the parts have to come off for replacement, often the part that is staying on will break aswell also requiring replacement, however I seem to remember that the 1.7 has a easy to seperate joint compared with the 1.4 and 2.0L engines.
-- Tony Stanley ++Always Learning++