I've read all of Van Vogt. Slan sticks out in my mind,the Weapons books less so. Hangning my head I have not read The Stars My Destination, but I have read about everything else Bester wrote. Harlan Ellison's stuff always gave me chills. In new stuff try out David Brin's Uplift Wars, the first 2 or 3 books, Greg Baer's Darwin's Radio, and Orson Scott Card's Ender Wiggins Books. Enders Game is brilliant, as is Speaker for the Dead.
The Day the Earth Stood Still is the best. The best science fiction is where the science is merely a vehicle to hang a good story on. That movie embodies that.