Agreed, not planning on replacing the head unit here. I'm quite sure we can get audiophile quality out of the stock unit.
Heck, even in my old PT Cruiser the stock in dash CD/DVD/Nav system had plenty of quality when paired with the right components. We went with a Zapco 7-channel amplifier, active crossovers everywhere, dialed in CDT Audio 3-ways in the front, and a simple JL Audio 10w6 sub.
Very, very clean, precise sound. It's not a boomer system at all, it's 100% for SQ.
I'll see if my shop can transfer the system over to the CT once I find one. The only trick will probably be re-doing the sub enclosure, but I'll likely be ripping the back seats out anyway and installing a cargo box, so they should be able to integrate it into that again.