ignition service kit for v10

hey guys im about to buy this kit from ecstuning for my s6. new coil packs and plugs, just wondering if its worth it to get iridium or some better spark plugs elsewhere or oem plugs is the way to go.

http://www.ecstuning.com/Audi-C6_S6--V10_5.2L/Engine/Ignition/ES2739155/