I think most people would recommend the Motorcraft copper plugs for performance and maybe the Denso Iridiums for performance/longevity. Not sure how many people are running the NGK's.
I personally recommend the Copper plugs because there is no noticeable difference between them and the Denso's but they are 1/4 of the price, plus (very big plus) you don't have to worry about breaking the electrode when you gap them.
I would have liked a to try a set, since I've had such good luck with them in several different engines,
but none of the parts stores around here had them.
I went with the "tried and true" Motorcraft Coppers.