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Why 24? That's why I'm asking...have one I've had my eye on, but I'm a tad hesitant...
Has a ton going for it. Not only being her first *full* appearance, she dominated the story and stole the show from Conan. It's also Smith's last and finest mainstream work (Red Nails is his finest overall masterpiece). The issue took top honors that year as best comic story as well, and still holds up today with repeated readings.
The best way to read it though, is Marvel Treasury Edition 14. Reprinted in oversize format with all the racy scenes restored and unedited from Conan 24.