We have a lot of the above mentioned things as actual requirements. But, I agree about the ICU (probably one of my rotations in school), as well as medicine Sub-i. Lots of people liked ID consults. For peds, heme/onc or outpatient might be good. ER is also kind of cush (here, at least - good experience but you don't have to work very many hours in total for the 4 week block because you take shifts).
Lots of people opt for away rotations, but I can't comment on that. Also, a couple electives people like (because they are low responsibility, generally interesting, and a last-chance to see this type of thing) were psych consults and pathology/autopsy.
If you're school doesn't require radiology and derm, I'd recommend those too.