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another one for NGK plugs. I ran them in my 2.2l alero, my 5 2.3l saab ecotechs, my Jeep, and currently have a set of iridium in my 3.4l alero. I typically go with copper plugs, especially on a 4cyl since they are so easy to replace. but I put iridiums in my 3.4l since it is a bigger pain to replace the rear plugs. The only real difference in plugs is copper = ~30k mile service life, platinum = 75k miles, and iridium = ~100k+ service life. there isn't a quality difference between them. They all do exactly the same thing, and as long as they have the correct gap, then any performance/fuel economy difference is because you're driving differently/you believe the advertising.
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