I know this topic has been beat to death but most of you guys have the OHV magnum engines it seems (3.9, 5.2, 5.9) and use the autolite 3923 or NGK plugs.

I have the 3.7 V-6 and I have the autolites in there now, it runs nice but I am due to change plugs soon and was wondering if there is a better plug I could be using?

 

My 2004 4.7 came with Champion 439's. I've replaced with the same plug at each interval. I got mine at Advance Auto for ~ $1.49 - $2.00 a piece.

They were correctly gapped out of the box. Who could ask for more. I'm due for new a new set real soon. I won't shop for another plug, because I am happy with what's been used so far.
(The set that I pulled out at 60k miles were perfect. I could have kept for another 15-20k.)