Last thing i ever care about in a Corvette is the sound system, the stock Delco is perfectly adequate.
Not for me, I have an 85 and the system is no where near my standards. Not enough of anything (ie. Bass, treble, mids..ect) One day I would like to get the entire interior redone by a stereo shop guru. I would like to spend about 10 grand on it. Custom boxes, new amps, new speakers, and maybe even a new dash set up. I want to keep all the controls where they are though. Oh, and new door panels also. I would get the stereo shop free reign of the vehicle. As long as in the end it looks and sounds good.
If I had that budget, I would do all rewiring, run a second battery, cut out the back floor and set the amp in it with plexiglass over along with 2 12s coming out of the back with 6 1/2s in the doors and some speakers under the dash as well.