If anyones gonna go copper, you cant go past NGK's V-Power design.
http://www.ngksparkplugs.com/products/cars...1200&country=US
The BKRxE series are the V-Power plugs with the grooved electrode.
The BCPRxES series are the ordinary plugs.
If you want the V-Power in the BCPR range, you have to get the BCPRxEY series. The BKRxE series are far easier to find from my experience.