Originally Posted by NecroRebel
For Wizards, yes, but for a general character, 16+ is the minimum, and 20 often too expensive for the benefits. The paragraph you quoted from was general advice, not Wizard-specific
Its a taste thing, I go 18 int for wizards so i've got decent hp, fort and will and can mix it up in close/melee range a little bit and take the heat off the party defender if needs be.
It also helps get to 13 wis for expand spell, which is something pretty much every wizard should take.
OP: do you know what the rest of the party is going to be? As that can help shape your spell selection.