Well it really depends on if the level 90 skills are coming or not.
If they're not, go light/fire/bich, cause those nukes are strongest and you will have KD which can save you in some situations.
BUT, if the level 90 skills will come, you should take light/ice/bicheon, because ice will have snow shield. If something hits you, a part of the damage they hit you, will be taken off MP. This is OK, since you will be pure int.
I don't really know alot about hybrids.
And if you're going hybrid I think spear is better.
But for pure int s/s for sure. You'll need the defence.
And armor is the best in my opinion. Cause you will be able to tank pure str's better.
Protector is fine too. :]
Hope this helped you.