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What Beav said.
However, concerning the longevity of the spark plugs, I researched this a while ago and my information may not be entirely correct, but in addition to the improved conductivity of iridium over platinum, they are supposed to be more dense and more resistant to heat, therefore longer lasting.
I changed my plugs from stock to NGK iridium after about 82k was put on the odo. They seemed alright. There's really no noticeable change when converting to iridium, but if you have plans in upgrading other spark and ignition related components I'm sure they won't be the bottleneck in the system.
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