clmt, are you sure? There are aftermarket tweeters you can buy, or just buy component set.
Many people replaced their Head units only and it is such a difference. Of course considering you are buying something that is better than stock radio. I went with kenwood, many prefer alpine or pioneer. I wanted to get something that actually had USB cable on it which I could run to my glovebox, only kenwood had hard-wired USB cable with female end, and has no limits to capacity on the storage media.
a few months after I bought mine pioneer came up with similar one, again no cable just port on the back.
Bill, I am still up for checking your jeep out one day, hopefully we can meet up.