I have the old version of the Canon EF 100mm f/2.8 USM macro lens and like it very much. I spent a few hours with it yesterday shooting flowers and warty gourds.
My avatar was captured with that lens.
Personally, because my macro photography almost always involves using a tripod, in lens image stabilization is not necessary. I would likely feel differently if I hand held the majority of my macro shots, but I do not.
Using a tripod for tank macros of relatively stationary corals allows me to use much longer shutterspeeds that I can't do hand holding. That in turn allows me to use apertures smaller than wide open for greater depth of field in my shots without having to crank up the ISO to do so.