NGK Iridium LFR7AIX. I get them from ebay mate. Or you could get them from Harold (Performancelub). Still perfect after 20,000 k's on my car.
Don't get the IKH22's, a few sets I have noticed the threads galling in the head, probably due to them being stainless, and the tip melts within 20,000 (on a stock Stagea). Perhaps the IKH24's might be better, with some anti-seize paste? Or just run the NGK's like me.