Cassette w/changer sounds about right. Even better if you could get an older pull out with the handle and carrying case.
Look for old school Alpines with the green pre set buttons on the right hand side, and a volume nob on the left. That would be Pimp.
Look for older speakers like Kickers with the gold letter logo's. Maybe some Lanzars with the red surrounds and the coated paper cones. Something like this:
http://www.credencespeakers.com/images/Lanzar-front-for-web.jpg .
A single 10" with amps mounted in the enclosure on the oposite side??
Either old school amps, or newer models with an old school no nonsense look to them. I know you can still find Rockford Fosgate 25 to life series amps, and they are styled like the original Punch amps.
I think a simple understated look would be old school, and maybe not as in your face as a neon loaded plexi sub box. Maybe wrap the box in vinyl to match the interior, and mount all of your speakers in matching door pods or kicks with matching vinyl.