If you find yourself easily confused, invest your starting points into int.
If, on the other hand, you are getting tired, invest in stamina.
Edit: but seriously,
this is my sk on blue and he has pretty reasonable gear (no ntov, some skyshrine) and he is far away from maxing intelligence or stamina.
Your starting stats won't be 'wasted' by being capped until you are really well geared, and when you are 1 SK surrounded by dozens of other people I don't think it will really matter.
I never regretted having low intelligence. I can usually manage it in a way where it stays functional, and it's kinda nice how quickly the mana bar refills!