My el Camino already had the radio hole cut out for the DIN config. So, I went on my trusty local CraigsList and found a great deal on a Pioneer DEH P680MP - It's a Satellite/AM/FM, CD, Aux input w/ removable face and a nice big round volume knob. It's got the usual 4x"50" watts and I'm running a set of KLH box two-ways mounted just below the rear "deck" panel facing forward, and a pair of Blaupunkt coax 5" cut into the kick panel covers.
I mounted the satellite receiver in the back storage pocket w/ velcro so I can remove it and plug it into a similar Pioneer deck that's going into the Malibu. Don't have to pay for more than 1 subscription that way!!
A decent inexpensive system, overall.
The Malibu will get a very similar set, but the rear speakers will be Blaupunkt coax 6x9s mounted to a reinforced rear deck w/ a custom grille cloth cover, so you can't see 'em.
Dan