I'll be tuned in with interest... but I'm NOT planning to replace my head unit.
Bear in mind I'm a 43 year old audiophile who's had a mobile audio side-career that simply evolved from passion over the years... I went to CES for 10 years, and SEMA for 4 as a product engineering rep - managed a retail start-up (while still in my IT career job)and still moderate a handful of DIY mobile audio forums... although far less actively than I used to.
I'll start by pitching an alternative to replacing your head unit -
I'd (I'll) personally spend my money on an AudioControl DM-608... use your judgment but I'm doubtful that I'd (or you'd) need the extra two channels of the DM-810. Both have anything you'd ever wish for in processing, including the ability to "fix" the factory signal, from both frequency/amplitude to frequency/phase/delay.
From there I'd feed straight into amps, and speakers of your choice. I have my favorites, but I've been out of the retail circles for quite a few years now, so if there are new standouts I'm not tuned into them.
I look forward to seeing what you do...
Locally here, not only aren't there any sound-offs, there aren't even any bass-offs anymore... I blame millennials. :laugh: Unfortunately... that's a joke but there does seem to be some truth to it. There's so much less passion to pursue anything of excellence these days, far more than other generations.
Anyway... check out the DM-608 and DM-801. Identical other than the number of channels.
And let us know what you do!