what do you think? more critical percent with more dex, and 150int is enough (150 int with 30 int weapon and 30 int robe)

nope, all in int, dex isn't useable for magican

150 is enough int defensively not offensively
200 int is closer to the mark

the dex idea is good though upon my warlock i use 40 dex 30 int robe in favour of pure int as he gets full amp (250's int) and it secures him from any extreme form of damage be it caster or melee. chain just as strong, wells a walkover
facing the increased damage is not neccessary, melee/caster whatever you choose I prefer to have a charecter with a stable base from where to strike

i would avoid adding dex over int. int as an added stat is the most powerful one available granting mana, defence, power and regen. there is no subsititute. adding some dex though with a strong base upon which to work will give benefits