Hi. I got kicked off another forum re my answers on a similar thread begun by you, so keep your fingers crossed!
Three parts to this:
Mamiya 120mm f4 Macro in various models (superb lens by all accounts—never used one)
All to date are Manual Focus; older lenses with an aperture ring are MA*, newer units without aperture ring are Auto Aperture/stop down on your AFDIII.
Mamiya 80mm f4 Macro MF/MA on AFD models (excellent—I have one). Gets to 1:1 with extension tube. Floating elements for close-range correction.
Large format lens or enlarger lens on Mamiya 645 bellows
This is the most versatile and flexible alternative if you can find a Mamiya bellows with movements (645 Bellows N)—then you can use tilt/swing and rise/fall to control depth of field and perspective respectively, just as you would with a large-format view camera.
*MA means manual aperture and stop-down. Not good for, say, candids at weddings, but fine for a non-moving still life.
HTH