Buying a Magnum, What do I Look for?

I definitely see how hard it is, I'm being pretty picky about it, too and it's been rough enough that I might end up buying a Charger instead if I hit a time crunch, but we'll see. I've seen a couple one owner cars that are nice, but they go quick and none have come up when I've been able to actually buy one.
I have 2 hemi rams, a hemi jeep, and the wife's car is a 2015 A8 hemi charger. 30 mpg and 13.30 quarters.I Can't complain about any of them. Any of the LX cars you will be happy with.