I have only had to replace the alternator and battery.
I love my Prizm! It has never failed to start in cold weather (recently it was -21F with -40 windchill and it started on the first turn of the key).
This car has been so good to me! I keep waiting for something to happen with it, but it never does!
84,000 miles on the same tires? You didn't replace the timing belt at 60,000 miles?