From what I've gathered:
OS Giken - Smooth, Reliable and most expensive
Nismo/Cusco - Practically the same. Might want use WPC treatment on clutch packs. Parking lot speed/turns will make the car sound broken
Quaife/WaveTrac/Torsen - Might boil fluid, a little cheaper than the clutch types, low maintenance, quiet/unnoticeable.
From speaking with you, you said you wanted to remove the rear sway bar, and that would help with getting the rear wheel to droop more and stay on the ground.
The purple Z had a Cusco, dunno if you heard it or not.
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