Aftermarket Sunroof

A roof skin is one thing, but if any of the roof structure/bracing was cut for the install then you'll be looking for a donor roof. With the value of almost any E body having gone through the roof (no pun intended), if the rest of the car is decent it could be worthwhile. For the same reason, though; a donor shell could cost you almost as much as a basic A body driver... but deals are out there.
All depends on your ability and where you're going with it.