If you want to get the highest profit, sell everything seperately on the bay. Especially the expert drums will fetch you some good $$$.
The ATL itself will require some work to sell. If you put in on the bay starting @ 1 US$, probably you will not get very much. At least in Europe service for the ATL-2 is limited, some spare parts are not available any more (I do not know about the situation in the US), and the machines are quite big. So the demand is rather small.
If you are looking for somebody taking the whole package from your hands and will take good care of it, you have found the right place with this forum. But the whole lot will fetch you less than selling everything individually.