USC Freshman Housing Options

My son got accepted to USC as an entering freshman for 2018. He is also a Presidential Scholarship finalist. He received the housing application announcement this week. He got his application in on-line, but is confused about which choices to put down. McCarthy Honors College seems to be the most desirable. Does anyone have any information about room choices there and what to consider other than price?

USC forum very active:

http://talk.qa.collegeconfidential.com/university-southern-california

Class of 2022 thread:

http://talk.qa.collegeconfidential.com/university-southern-california/2023383-usc-class-of-2022.html#latest