I would still invest in dexterity because it boosts your ranged resistance and your heightened reflexes which in turn boosts your chance of dealing a critical hit.
If you're ONLY playing as a mage and no ranger or warrior, I'd go with 2 intel, 1 dex, 1 str. However, if you'll be incorporating various skills from the 4 different areas, think about what you want to use early on so you can plan to add skills accordingly.
