I just bought some Bosch plugs. I don't remember the name but they had the 4 ground electrodes, platinum +4 I think. They seem pretty good. I had 48K on the originals, and they looked pretty good still.
I am old school and still look for the old Champion single ground electrode plugs. I used NGK in my race car (Toyota Celica). The Bosch always seemed to miss at higher rpms, but these in my 2005 GTO run very smooth....so far. Pricey though, 50 dollars for 8 plugs. I miss the old dollar plugs....sigh.