I've been watching my way through the AFI top 100 (currently only at #18...I have a long way to go).
Oddly, I'm also watching my way through a couple B (actually, mostly C) movie collections. Two "outstanding" films in this collection are:
The Giant Gila Monster
Attack of the Giant Leeches
Most impressive are the special effects--especially the giant leech outfits...neato.