Ah, I'm a big fan too, but rather on the 8 bit parts - not that I don't like 16 bit stuff, it's just I found the minimalistic sound of Commodores, Spectrums, and NESes more charming.
I also ripped some 200+ music files for Abandonia's music player.
Not sure I can find YouTube examples now, but so far my favourite DOS game OSTs are...
Doom 1-2
Discworld 1
The Legend of Kyrandia 1-2
Loom
Death Gate
If I had to name my favourite console tunes those would be:
Double Dragon II (NES)
Final Fantasy IV (SNES)
Final Fantasy VII (PSX)
I also dig cracktro music, or old intros / demos, but that's another story.
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