Since no one has replied, I guess I'll jump in...
My personal opinion on spark plugs is that as long as you stay away from "gimmicky" plugs like split-fires and gap them correctly, you should be just fine in near-stock applications. Bosch, Champion and Autolite are all good plugs. I have read that platinum plugs last a bit longer, so it is going to be a personal preference.
To be honest, there are better things that you can change on a 96 to improve performance. The stock spark plugs/ignition are far from the weakest link on a stock or near-stock 4.6.
Just my 2 cents...
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98 GT
Dyno-Max cat-back exhaust, 3.73 gears, Steeda shifter, Ford Motorsport Underdrive pullies, 87mm MAF and Roush cold air kit...
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