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Vern,
Aluminum oxide media is very abrasive and they don't recommend using it in the cabinet probably due to messing up the plastic window real fast. It is great for taking heavy rust off parts like cast iron manifolds. Silica sand falls into the same category. Glass bead is a good general purpose media and is fine for the parts you mention. It won't damage (severely etch) the surface of sheet metal parts like sand or aluminum oxide can. I've never used walnut shells or plastic media, they are good for stripping old paint without damaging or distorting body panels. You should do fine with the glass bead, then follow up with a degreaser and epoxy primer or your preferred primer.
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