1. The 'Alien' Heavy Metal comic would rank as my first place choice - I was too young to see Alien in the theater in 1979, but I studied the HM comic and the photo-novel exhaustively even before I could see the movie.
2. The original AvP and the Dark Horse USCM comics are tied for second-place for me. AvP because AvP = 'nuff said; and the DH USCM series because they started publication when I was in boot-camp, and a friend mailed them to me. I thought I'd get a lot of flack for reading comics, but a lot of other recruits wanted to read them too. Sadly, I didn't get to keep them, and now am in the market for them again, if I can find them cheap (which so far looks impossible.)
3. As for the others, I confess I haven't read them yet.