I think at the high end the debate is completely academic. When you've got several +100 mana/HP items loaded with INT, the added +25 INT or STA is pretty meaningless for a Necro. Even the extra 60 HP from STA will be functionally unnoticeable for both solo and group/raid play at that point. However, I think that pumping INT gives more flexibility for gearing during the leveling process, and allows you the breathing room to heavily gear in favor of raw +HP while still maintaining a decent mana pool.
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