my build is almost always boots 1 -> unholy grail -> rod of ages -> rylai's -> shoes of any type -> rabadon's/void staff/abyssal depending on the enemies -> zhonya's if they have too much ad
masteries are 21/9/0 so you get some cdr and some tankiness (always revive mastery), no cdr from runes, just damage and tankiness.
you shouldnt be building more than 15% cdr since you can easily get 4% from masteries and then 20% from her w (maxed last).
I also like maxing e first, since the snare gets a longer duration and does about the same damage, with a slightly longer cooldown. q second because it has nice damage, and w last for lategame cdr.