Personally I'd go with the SICU. But then that's were I got my experience.
In a busy high acuity SICU you can see just about everythign there is to see. I did high risk OB, had people on IABP, and just about every medical condition under the sun as well as the trauma and surgical conditions.
But bweing honest, just going somewhere with the hight accuity possible would work for most people.