Not bad Not bad

It's a fairly good guide. I only would switch the masteries a bit by spending more in def masteries. You focus a bit too much in mana I think, in begin game you indeed have mana troubles. But I never have mana problems late game because my auto attacks does all the work. (combined with skills of course).

So I would have Banshee's only for the spell blocking. I would switch or randuin's omen, or banshee's veil for an AD item, or something like frozen mallet.