Thanks to all for the help on this one. The son & I went shopping and he picked Rockford Fosgates.
The choices became extremely limited as he stuck to his severe install limitations. If he used even a 1” bezel to allow for more depth for install on his fronts (the Focals) he would end by tending to scrap speaker grill when he hits his clutch. Rockford was one of the only units we could find with the necessary shallow install depth required for the 6” fronts. He had unlimited depth for the back deck 6 x 9’s. He purchased 6” coaxial in the front and 3 way coaxial in the rear 6x 9’s. Sounds nice.
He spent half of what he had saved and budgeted for, and is wheeling and dealing to add this saving into our budget and purchase a Christmas sub setup for the car. This will cost him more than the 4 speakers combined. He’s very happy with it. Thanks again!