For a kinda-stock looking radio, I put a Blaupunkt Bahamas MP46 in my 300D. It doesn't look 100% stock, but due to the ability to change the color of the interface, it looks a lot nicer than some ricer-radios out there. No ugly VU meters bouncing around, either.

As for speakers, I can't say much on that subject yet. I'll be upgrading mine soon (the rear speakers are incredibly quiet.. I'm wondering if the PO hooked it up through the fader..), and I'll probably be going with MB Quart's in the rear, and Kenwoods / Pioneers in the front.

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(Oo{=|=}oO) 1983 MB 300D USA, 212,000mi. 80's yellow/white. "Gunther"
(Oo{=|=}oO) 1984 MB 300D Euro, Turbo Added in Germany, 186,000mi [SOLD] Missing her dearly.
(Oo{=|=}oO) 1984 MB 300D USA Turbodiesel, 269,000mi. [SOLD]