Thanks for the comments guys.
In Australia, The OEM NGK Plugs cost me about $5 (retail, from my Kymco service centre so it's probably a $3 part).
The NGK Iridium Plugs from my local "Parts Boys" shop will cost me about $22, but I can get them on ebay for about $17 (Delivered).
Decisions decisions....
I guess even if they don't improve the performance at all, they will still last longer (apparently)
BTW, I'm looking at ordering one of those "Joe Costa" Variators, Any words of wisdom or past experiences or rumors of failure or stories of stratospheric performance gains (or any advice at all?).
No one I've spoken to locally has even heard of them, let alone bolted one on so any help would be appreciated seeing as I'm about to spend $200!
Josh.