The Abyss special edition
I've got the Original 'Special Edition (R1) released about 6 years ago!... Much Better story.. Has the 'Rat Scene' and the Tsunami..
From the Earth to the moon (tv mini series dramatising nasa's apollo program)
Can't recommend this enough!.. I got it for £10 from Asda at Christmas and watched it in a Day (12 Hours solid!!) Fantastic, Funny and Moving (to the point of tears in some places!!)

And Obvously Apollo 13 (I've got the R1 Special Edition with the Theatrical Version and the IMAX version on DVD)... Watch this when you get to the Apollo13 story in 'From the Earth to the moon' and you'll see a few continuity errors in the film (the TV series is more accurate!!).
If you can find it... 'Silent Running' a fantastic moving story of a lone man (Bruice Dern) and three service robots (Hewie, Dewie and Lewie) on Earths last Forest/Hydroponics starship, Instructed to destroy the forest, Dern, Takes the ship to save it and its cargo!!..
Soylent Green,
Omega Man (the proper version of I am Legend),
Planet of the Apes (all of em... even the Marky Mark version!!),
The Time Machine (OK Both Versions... the remake's not too bad!!),
Logans Run,
Red Planet (not as bad as you might think),
Mission to Mars (a bit of a Hippy Vibe and the Face on Mars has been disproved!.. But not too bad),
Battlefield Earth (Atrocious Film but a good Giggle!!)...
I could go on.. and on.. and on.....