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You'll be using the form for a third party CS if you didn't buy it from PHP.
So far my custom tow tune gets me the best mileage. A regular grade performance and premium grade performance are also very fun to have. You can have all three on the programmer and run which ever one you prefer.
These are the gains expected for the 04+, I seem to remember the older ones like yours being around half this.
• Gains of up to 35 HP and 45 ft/lbs (5.4L 3-Valve engine)
• Gains of up to 25 HP and 40 ft/lbs (4.6L & 5.4L 2-Valve engine)
Luckily you have a rather common list of mods so it shouldn't be very difficult to tune.