From best to worst with my votes in bold:
Contact
Cocoon
Dredd
Akira
Total Recall
Them!
Men In Black
Independence Day
Akira vs. Dredd is a close race. Actually, Neo-Tokyo kind of resembles a nascent Megacity-1 ...with just a touch of Heavy Metal. Then what happens there is like X-Men 3 mashed into Altered States. I like how it turns the superhero story on its head. But then, the line between "scanners" and radioactive monsters always was thinner in Japan - it's all techno able to go terribly wrong.