firstly, if the car is gonna be given a hard time dont even look at iridium or platinum. they'll foul out quicker and cost you 10x more money for no gain.
you should only run standard copper plugs especially for drifting. dont trust my memory too much but i think they are NGK part number: BCPR6ES-11
ill double check for you tonight.
main reason why i use NGK is because i know they work, and i always have them in stock at my work.