Wow this is a difficult one. Are we presuming hypothetically that still EVERYTHING would be available for retail? In that case it would probably be the Cave Troll from SS/Weta (thoug Weta isn't mentioned here). That 's just my real only "holy grail" and will prob never get it unles I win the lottery.
If we have to choose from things still (sort of ) available it woul be Sideshow's Alien Warrior bust.
I really started with the Alien warrior bust from Paliases btw.. just thought of that. That would be a nice parrallel then.
It is one of my most favourite creatures in movieworld.