i'd say a safe bet would be the NGK's. it's okay to experiment w/others like the ZEX, but just like Stan said if they are breaking then obviously they aren't ones you want to stick with. btw, that front end looks familiar (stillen)....wait,,it's mine too. it used to be so awesome cuz i was the only person in WA i ever saw with it after i special ordered it but like 2 weeks ago some dude was rolling w/it. kinda pissed me off (enjoyed being distinguishable), seems like alot of people are going w/it now. i still think it's the best looking though obviously you too! nice car.