I think currently ATFLIR should be a top priority for the Hornet right now, as finding targets from a stand-off range is just as important as being able to engage from that stand off range. HARMs would be second just to give BLUFOR an actual SEAD aircraft.
Besides that, I think either Mavericks or LGBs would be the next best additions, with Mavericks taking lead just because of the stand-off capability