Thanks gfan, that is really helpful (frightening, but helpful)! I thought I had read somewhere that Mysterious Island was going to be the full serial...?

I will definitely be springing for:
The two Universal sets
The Sam Katzman set
Conqueror Worm
Tales from the Crypt/Vault of Horror
Chosen Survivors/Earth Dies Screaming
Pharaoh's Curse/Curse of the Faceless Man
Return of Dracula/The Vampire

Not to mention the BBC Count Dracula with Louis Jourdan and Addams Family vol. 3 in Sept. Yikes!