ahhh ok, I was thinking you were talking about more recent flicks.
yeah, I love both of the originals too, and yep while its partly 'the nostalgia' of them, that nostalgia aside I still truly love them on their own as flicks. I think they hold up, and you're right about the original Godzilla having that eerie effect. And Im a big stop-motion fan so that gives me another reason to love the original Kong. (I also remember loving the original 'Mighty Joe Young' as a kid too, though I haven't seen it in ages so I don't know if that one holds up or not lol)

The two more modern era monster flicks I've really dug a lot were "The Host" (Korean movie from 2006) and "Cloverfield".