Rob at NeedsWings is your friend. Plugs and wires are what I'd recommend if you're due. One or the other and you're just cheating. Get a set of stock heat range plugs unless you're going crazy with the power adders then go a heat range colder. Also look into a set of Magnacore wires. They're better wires and they cost about the same as OE replacements plus they'll add a little color to the engine compartment.