In your opinion,is better to go in offence for AP's or go classic in utility? I prefer utility cuz i think u dont get so much in offence

Lots of AP, Magic Pen, CDR and a mini Rabaddons, definately 21 offensive points.

Perseverance too high in Utility nao. Also, you can reach max buff duration with 9 Utility points now instead of 10.

21-0-9 http://imageshack.us/photo/my-images/267/masteriesap.png/

not really a big fan of utility even on AP, except for the summoner cooldowns. mana problems can be itemized and largely disappear after the early game.