I will be running standard plugs, In my experience expensive plugs with plarinum or iridium tips are fitted mainly to extend the service replacement life of the plugs. You may get amarginally better spark but on an engine with a comparatively primitive combustion chamber any gain would be very marginal. Many manufacturers make great claims for performance spark plugs but in my view they are a waste of money, losing wieght would be a far more effective way of gaining performance( easier for me than you)
Strangely enough I contacted a guy from the sellers ID (Powersparks) and he implied that they would sell direct at lower price than that on Ebay - especially when any sort of bulk volume purchase was being made.....