for not a huge amount of extra cost look into magnacor plug leads. because they use a wire conductor, they can be more reliable long term than standard oem graphite. they have good quality insulation too.
another thing worth mentioning: when fitting new plugs, keep sweaty fingers off the insulators. sweat salt is hygroscopic and can leave a moisture conduction path for the spark. [same for rotor caps and rotors, though this may not be relevant for you.] never wire brush a plug - it leaves metal traces on the insulators and again, this can provide a leakage path for the spark.