This is machine dependant.
The BK117 for example is not cruise limited at MAUW OEI until about 6000 ft (and that is insufficient climb gradient, not drift down).
The Black Hawk on the other hand is cruise limited right to sea level, but you can always jettison fuel/external load/fuel jugs to make it a non limiting factor.
Also if the landing DA is significantly different from the T/O, then the higher one may be the limitation.
Also, define your limitation? Are you talking in terms of OEI? Airframe? Cat A? Helidecks? Passenger Charter? Drift down? Range? or what?