Anything inpatient (esp. w/ call) is generally not a good idea. Other than that, pretty much everyone understands where your priorities lie. If you're having difficulty getting time off to interview, I'd talk to your dean's office... they are much more concerned with getting you matched than "learning opportunities" during an elective rotation and should be able to help.
That being said... path, derm, rads, gas, ER, allergy are the popular ones at my institution for dec/jan.