spark plug heat range questions.

I have thought about the hei upgrade, i have a ton of stuff off the internet printed out on paper with instructions on how to do it.
the two main things that scare me away from the hei upgrade, number 1 the ability to be able to rev over 4500 to 5000 rpm is gone, number 2 its a gm ignition and i have a dodge product.
I have been a die hard chrysler guy ever since i knew what a car was, my old man was one of the biggest mopar fans around, owned countless mopar cars and dodge trucks. I have alot of friends that are die hard Gm fans, if i threw on an hei ignition on my dodge i'd never hear the end of it from them. I know that dont truely matter and i know the hei ignition is a good system. But i figure if i'm going to get a new ignition, i'll spare myself the flack i'd catch from all my die hard gm buddies and save myself the thought of wondering if i can turn to 6000 rpm or not and just get an aftermarket cd ignition.
I would most likely get the crane hi-6 cd ignition box because i already have the crane lx91 coil. I'd be looking at 249.00 for the crane hi-6 cd box and thats it, other then wiring it in wich to me appears to be very simple from all the wiring diagrams i have seen.