There was a big discussion about this before the big crash, and I believe the general concensus was that coppers are the way to go. They do need to be changed about twice as often (I think) as the platinums, but I believe they only cost about 1/4 as much. There was some talk about copper producing a better spark since it is a better conductor than platinum, but I don't think it would make any difference. Copper :thumbup: