I have gotten my hands on a reasonable collection now, and am still looking for the following models in particular (This list is assuming a pending trade will complete; If not, more will be added to my want list):
-Screamer-Killer Carnifex models
-2nd ed Termagants & Hormagaunts
-2nd ed Gargoyles
-2nd ed Lictors
-3rd ed Tyrant Guard
-3rd ed Raveners
-1 3rd ed Old One Eye
-1 current Lictor (for a Space Hulk Kill Team I'm working on)
-1 current Broodlord (again, for the Kill Team)
-Any old Armorcast Tyranids (Malefactor, Exocrine, etc)