Yeah Dune was awesome. What a difficult book to bring to the big screen! Done with great imagination.
Total Recall was heaps of fun. So was Starship Troopers.
Brazil had a big impact on me, probably dated a bit now.
Does Robot Chicken count

Supremely funny.
2001, Blade Runner, Alien all superb
The Fly was great
District 9 gritty
Love this genre! Saw The Day the Earth Stood Still (1951) recently just to see what the early stuff was like, worth seeing if you're a sci-fi fan.
This year looks particularly good in terms of industry investment, let's hope the quality is there too.