... I think you're only missing two? There are 4 Alien movies (set in the future), the first two Predators (the second of which I haven't seen in years), the two AvP movies (the second of which is the source of the Gunnison anecdotes above), and then the new Predators movie that just hit theaters. (It's most like the Arnie Predator movie, if you want to compare it to the rest of the series).

Glad you enjoyed it! I'd love to mix Lex in with another universe, I just haven't decided which yet; but I didn't want to forget all the little snagged setup threads that were bothering me, so I took them down as a standalone snapshot. =)