I'd definitly say One Song Glory from RENT. If that isn't belting then I dont know what is. Maybe also What You Own? Thats a pretty powerful song and I'd call it belting but I'm not the most knowledgable person in that matter.
I wanted to get something that an "ex"-junkie like him would really appreciate and cherish....it's a brick of heroin shaped like a heart.
-Scrubs