There are a couple of threads here regarding the Mopar/Kicker speakers. Sound improvement is purely subjective but there's at least a half a chance of decent performance if you get products designed for the system. For instance your application should call for the 77KICK28AB front door speakers and dash speakers. The rear doors are 77KICK41.
Apparently you misunderstood comments regarding the front speakers because they do make a huge difference.
For about $1200 you can get a Kicker amp setup that uses the stock speakers and also has the sub bass for the back. I don't know the PN for that though. It's a little too rich for me.
I have the 77KICK.. setup isn't my 3500 CC and they made a big improvement. I did tweak the equalizer from the stock speaker settings. I have the 5.0 HU.