Glad to see we have some sci fi buffs in the group.
I love the classic sci fi flicks. I would go to the movies as a kid and stay all day until my mother came into the movies to drag me out.
Some of my all time classis favorites are:

The Day The Earth Stood Still
Forbidden Planet
Thing From Another World. Like the remake with Kirt Russell.
Shape of Things to Come
First Men in the Moon

I purchased all the 105 Babylon 5 episodes and am watching them again.