The E46 M3 is still very expensive($100,000+)
The choice for the E36 M3 is the 1997+ 3.2 litre six speed manual box.
Early ones like a 1994 3.0 litre, 5 speed is ok. AVOID ALL SMG boxes. These are not the real deal.
But I have a bit of a problem paying $65,000+ or whatever for a 2nd hand car of that age. And the repairs can only be done at a BMW dealer.
I'd rather go safe and get a new or near new Falcon XR6T or a Mazda RX8.
T.