Alright so We have an 1990 Allante with the dead bose amps and a dead cd player. Has anyone gone and installed an aftermarket DIN Stereo, speakers and amp(s)?

I have replaced my CD player with one from www.lajollaaudiorepair.com ($225 total cost). I recommend them. Call 'em and see what they say.

They also do bose amp repair.

At least one Cad dealership in San Diego subs all their audio work to them so they've got tons of GM related audio experience.

Good luck!
..rickko..