Standard NGK's should be more than good enough, I changed mine when I first got my car as it had some old champion plugs in.
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It made a big difference in the running of the car.
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I only paid about
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£7-8 for 4 NGK's from a local motor factor.
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Code number
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(3720
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- BCPR6EY-11)
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The main thing the Iridium ones give you is a longer life but if you're servicing your car regularly then you dont need the extra time factor.
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Not sure how much they'd help on a tuned engine but on stock I'd save yourself
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£20 to be honest, unless anyone says anything to the contrary?
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Cheers
Tom