You can spend $15 a plug or buy 5 plugs for $3 each. I guess I would go with the latter as it tends to keep you busy with maintenance (which allows you to notice issues much sooner) every 30-40K rather than 100k or more. I wont say that quality plugs dont make a difference, but how long are you willing to keep them in? Do you want to pull threads out in 100k miles because they were never replaced? Buy plugs at autozone, carquest, napa, or the such (ask them for the standard plug) and get some antisieze and dielectric grease.
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