One of my classmates also matched at the program where he did his away, a university program in Manhattan.
To make the most of your away, make sure you introduce yourself to the PD early. Spend some time in their section and make it clear you're a visiting student interested in their program. At the end of my month I scheduled a meeting with the PD and had a half-hour chat, where I reiterated my interest.
If the program's not top 10, then it takes away the whole guessing game aspect on the PD's behalf when they are trying to decide, assuming you are qualified, whether you are worth giving an interview, or if you would go somewhere else. With 80-100 interviews to hand out to 500-700 applications, it can make a difference.