Attack the Block

Rent-it - If you liked Hot Fuzz or Shaun of the Dead you will love this British sci-fi spoof about a group of inner-city kids who go to war with aliens.

Red Planet

Skip-it - Admitting that I have watched this over a dozen times on HBO in my lifetime, you should skip this special effect overload with a handful of uninteresting characters with recognizable faces.

Aliens

Buy-it - 7 years after the first deep space alien sci-fi film was released, the sequel, also starring Sigourney Weaver and still directed by James Cameron, hit theaters and quickly (quite literally at 1 hour and 17 minutes) became one of the best sequels ever made - in any genre!

Back to the Future

Buy-it - If you don't already own Back to the Future on DVD or Blu-ray go get this 80s adventure comedy now! If you do already own it, jump in your Delorian and go back in time to return it, because this is the special edition you have been waiting for!

Alien

Buy-it - It is hard to believe this deep space action thriller starring Sigourney Weaver came out in 1979 (four years before I was born), especially with the remastered special-effects in Blu-ray high def. Alien is still the best sci-fi horror movie ever made - 30+ years later.