Plug and play chips will work for a majority of customers I think. They are usually well tested and safe. I have worked with high power turbo imports previously and the full stand alone engine management systems allow lots of tunability, but also there are more possibilities for pitfalls and engine damage for the novice tuner.

As for the thread topic, since I am an old school Mopar gearhead, I would like to see the following aftermarket parts:

Aftermarket Shaker hood
Tubular header kit
Full 3" dual exhaust with Flowmasters
Supercharger kit (preferably twin screw whipple charger)
R/T side stripe kit
Bumblebee rear stripe kit
Suspension kit (for drag or lowering for increased cornering ability)
Go-Wing rear spoiler
Maybe a T/A Challenger retro kit with fiberglass hood and side exit exhaust