You've probably got your new pickups by now, but in case you haven't:

The neck D Activator has very similar output and EQ to the Super 2, which was designed to be paired with a Super Distortion (and arguably pairs even better with the Super 3 bridge pickup). 
If you want to play hard rock / metal with high-end cut from your neck pickup, without the risk of it getting thin or brittle, either D Activator or Super 2 would be a great choice.  I don't think you could go wrong with either.
D Activator is more articulate and is the most harmonic neck pickup I know of (more harmonics than some bridge humbuckers!).  Super 2 has slightly more low-mids.