Two answers; Aliens and Terminator 2. I enjoyed these sequels far more than the originals (although I loved the originals as well). The story-lines were much tighter IMHO (and in the case of Terminator 2 the budget high enough to kick serious butt too).
having a crotchety sort of day today...saying to much of the world, "Get off my lawn!!!". Gonna do a mini spam later but keep in mind my mood LOL.