I right now I have a box blade, tiller and aerator for mine. I will be adding a soil pulverizer and auger soon. Not much brush hogging or field mowing in my area. I mostly use mine for landscape installs and grading.
Out of all my attachments, my aerator makes me the most money. I can aerate large properties faster than most of my competition as they are using walk behinds. I also have a few other contractors who have me aerate large properties for them.