What dogg said.

 

Had to order mine(ngk copper) from autozone, no one in town has em in stock

 

I'll be getting my copper V-powers from AutoZone as well.
From what I have read, they used copper in our Hemi's because the head design is good for power, but sucks for emissions. This is why there are 2 plugs per cylinder. The hotter fire of the copper plugs also aids in a more complete burn as well.

My wife's 09 Caliber also has a 30K plug interval. Gonna be awhile though, Had it for about 16 months and just turned 9K

 

I've got Denso Platinum TT's in my 5.9, they seem to be working fine, only had them in for about 5k now though. Definately working better than the plugs I took out, I think they were origional w/ 60k on 'em.

 

I've had platinums in my 04 Hemi Sport for over 2 years nows. Never had any problems with them. I've ran them in my Mopars since 98 without problems.