Originally posted by pres589 Out of the options you mentioned I would probably get a Tamron Adaptall 90mm f2.5.
EDIT: I would really like to try shooting with an M 50 f4 Macro but I've never used one so grain of salt with that one.
I have the M50/4 macro. It is very good indeed. It made me tons of money doing copy work when I was running my own custom lab, and now that I am just shooting for fun on digital, I am finding that it is still a very good lens. I can't compare it to the A series or autofocus lenses, I don't own any of those, but it satisfies my needs.
I've never met a macro lens that wasn't a very good lens.