I think it depends somewhat on where u go to school. In my case, my med school no longer has an anesthesia program and we have several locum tenems and in general the attendings are not well known in the field. So I felt it was important for me to do 2 away rotations (the 2 other guys in my class going into anesthesia also did 2 away rotations), since I knew I had to find a spot at another school. Like 2ndyear said, a critical rotation would be another excellent choice for an elective, especially if the unit is run by anesthesia. Work hard there and you can get a solid letter. Good luck!