I'm getting close to replacing the Grand Prix in my 380SEL as well, and have run into similar trouble finding a deck that doesn't have 40 colors of flashing and spinning LEDs that would look WAY out of place in my car's dash.

Best lead I've found so far is Blaupunkt. They have some models with the new-age flashy stuff, but also some that hark back to understated, simple, functional German design. Took me forever to find these, so I'll pass on the info here.

For low-end, check out the Miami (picture here: http://www.blaupunkt.com/receivers/receivers_98picpage_miami.html )

For high-end, check out the Sydney (picture here: http://www.blaupunkt.com/receivers/receivers_99picpage_sydney.html )

The Sydney has the ability to change LED color to match the rest of the car's lights. I'm pretty sure that's the way I'm going to go...

Problem I'm having is finding someone who deals the high-end Blau stuff in my area... may have to go thru Crutchfield.