I'm partial to Internet Club and their various pseudonyms (新しいデラックスライフ, Ecco Unlimited, probably something else I'm missing), plus Laserdisc Visions, Computer Dreams, Kodak Cameo, and 情報デスクVIRTUAL. My friend's been trying to get me to listen to OPN for over a month now.
I occasionally try to attempt to produce some myself, but I don't think I have it in me. My workflow is more based in sequencing virtual instruments than in sample manipulation. Maybe I should go try to find an old Roland MT-32 on eBay for extra cheese. They probably go for nothing nowadays.