using who and whom with infinitive

I've been it at it some 80 years and still I'm not sure. I'd say whom but not sure just why

In collo we almost always say who

http://www.google.ca/#hl=en&gs_rn=11&gs_ri=psy-ab&pq=%22of%22%20pronounced%20as%20%2Fɔv%2F%20or%20%2Fəv%2F%20here&cp=0&gs_id=y&xhr=t&q=+easy+to+decide+who+whom+to+choose&es_nrs=true&pf=p&sclient=psy-ab&oq=+easy+to+decide+who+whom+to+choose&gs_l=&pbx=1&bav=on.2,or.r_qf.&fp=2e25746a28e939f8&biw=1184&bih=753&bs=1

If those rules that described the case distinctions between who and whom actually still existed, there would be no problem for any number of native speakers to venture forth with an answer.

That there aren't a plethora of such native speakers illustrates clearly that those rules no longer exist in modern day English.