After going through this process last year, the one thing that i can say with confidence is to rank them how you like them, not based on phone calls and/or letters. In the end, that's all that matters. It's a long road and happiness is something that you should not compromise. so if a place that you had #4 calls you, don't move them up, b/c No. 1-3 may not call anyone and they may want you. good luck, and enjoy your last year b/c internship...well, it's internship.
peace
