Lately I have had good luck with the higher end NAPA batteries. I have a 6V and 12V that are going on 5 years now with no signs of trouble brewing.
Pretty good life on your Ford battery. A friend had the battery in his 98 Dodge last until 2 years ago, and I had an Interstate last 11 years in a Diesel Mercedes (but my Mom had a newer Interstate only last 3 years in her car).
Remember to put the new battery on a slow charger before installing it. That will greatly increase its life, starting out on a full charge.