What are your top three sci-fis?

Dr Who:
A great classic. I grew up watching Jon Pertwee as the doctor. Those daleks were hilarious with their evil voice sound effects
.
Blade Runner:
I've never had the chance to watch that. A lot of people and reviews have said its excellent. I must find it one day.
.
Red Dwarf:
That tv sci-fi comedy is a classic, very funny and hilarious, and very British of course

Blade Runner:
Still need to see that, yup even after all these years
.
Original Stars Wars Trilogy:
A great classic, though the muppets and creatures are somewhat childish
.
Alien 1:
A lot of action, the creature seemed more advanced than the technology at times. Some good special effects though
.
Matrix:
A bit abstract for me. The ballerina type martial arts not my cup of tea
.
Terminator:
Great movie
.
Moon:
The review had an interesting story-line about alternative energy from moon rocks. However, I'd probably get bored being an action-freak. It'll probably have a lot of talking in it.
.
Interstellar:
I haven't seen this movie.The review has an interesting story-line of a newly found time wormhole into another galaxy as the characters are searching for another earth-like planet to ensure humanity's survival. Sounds interesting, I hope there's a lot of action, I get bored easily. I gotta look that one up.

For truly elegant sci-fi I would also mention Ex-Machina. This is a very intellectually interesting sci-fi as opposed to the emotional component of the first three I mentioned.

But I don't think Ex-Machina will leave as much of a mark on the sci-fi movie genre as the first three films I mentioned. Very few others have.

Man, you haven't seen much.... Interstellar was on all movie screens last summer. "Moon" is not an action movie indeed. It's more contemplative and psychological. Very little dialogue though.

Ex- Machina:
Never seen this one, sounds interesting though. The wiki-review says its an AI movie about a billionaire who has produced state of the art AI female robots that he keeps confined at his home. He assigns some guy to intelligence test these robots which he later becomes emotionally attached to them, and tries to help them escape their confined existence. Hope there's not too much talking and emotional stuff, I get bored easily. But maybe it'll be a fast moving drama...

You will have to experience this one for yourself. This film is extremely good (and subtle) about leveraging the biases of the viewer to make its point. So I can't tell you much about it without risking its value to you. Suffice it to say that the plot is not what is valuable in this film. It's more the implications of what the climax reveals about human biases of perception.

Sounds something like "Oblivion" where the climax happens somewhere at the end

Forbidden Planet (I can't believe no one chose this one yet)
Bladerunner
Men In Black

And Ex-Machina if I was allowed a 4th.
'Her' was good too.

Most film climaxes happen at the end. Oblivion and Ex-Machina are in different leagues when it comes to the subtlety and nature of their message.

Forbidden Planet was great for its time. If we go into the oldies, then Metropolis by Fritz Lang was pure genius. The French animation movie "Planete Sauvage" was not bad either.

Oh! And the first Planet of Apes, with Charlton Heston.

What are your thoughts regarding originals Sci-Fi movies and television series being rebooted and re-imagine into new movies and new television series?

Examples includes:

Battlestar Galactica (1978-1979) vs Battlestar Galactica (2004-2009)
RoboCop (1987) vs RoboCop (2014)
Total Recall (1990) vs Total Recall (2012)
Bionic Woman (1976-1978) vs Bionic Woman(2007)
Knight Rider(1982-1986) vs Knight Rider (2008-2009)

I enjoyed the 1970s Battlestar Galactica. I disliked the newer Battlestar Galactica for multiple reasons. The main reason I disliked the new Battlestar Galactica was the storylines had Cylons taking human form where the humans could never be sure if someone was human or Cylon. That ruined the very essence of the show. I could no longer watch the new Battlestar Galactica after watching the first few episodes.

The new 2012 Total Recall was extremely boring. The storyline was extremely weak and forgettable. The original Total recall had much better action and it was a lot more fun to watch.

The 2005 'Hitchhiker's Guide To The Galaxy' was much better than the earlier one. Fun watch..

I've heard of the Hitchhiker's Guide, but I've never seen it.

The book was one of my favourite reads when I was a spotty youth.

You probably have to be British to get the finer points of quite a lot of the humour, but I would still recommend it as a good read.

1. Red Dwarf.
2. The early Star Wars trilogy.
3. Galaxy Quest. One of the funniest films I've ever seen. Alan Rickman was brilliant as a tetchy, cynical English actor, having to demean himself in order to earn a crust,

I was originally a series on Radio 4. Then came the book, then the TV series.

Actually I see nothing in the OP that excludes books from the subject.

Unless I hear otherwise before then, I'm probably going to include some books when I compile my list.

Instead of the official movie "Terminator 3: Rise of the Machines"

I strongly recommend the fan-edit "Terminator 3: The Coming Storm"

The official movie was pretty bad. The fan-edit is a worthy successor to the first two films.

That calls for a Google search. I'd love to check out a radio series of Hitchhiker. I have good memories as a young kid of a sci fi radio series called X-1.