Good list of trilogies (and beyond).
I would add Phantasm. Sure it has tons of 'wtf' continuity moments, but still, I just dig the films and it never got to that self-parody point like a lot of horror films.
I have to disagree on The Howling. I just don't think it's that good, and it really hasn't held up well (says the guy who likes Phantasm, lol). But I love my werewolf movies, so I tend to get over-critical.
I get what you're saying about its influence, but meh. It's one film I actually think could have a decent remake. It's got a great story, I just think the original film could've been executed a bit better, and it got a little hokey at times (again, says the guy who likes Phantasm).
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