This is the build I've been using, except I have been getting the phantom dancer after Starks Revenge. I start with a mana crystal and a health pot or two, then go back and get either sheen or boots, depending on whether or not I have enough gold from laning or I feel I need the mobility or the damage more. The Starks helps keep up your ASPD while also giving you some Lifesteal which makes farming mobs easier around mid-game.
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Using this buiild:
cloak & Dagger
I was dominating pretty hard earlier. I 2 shot a tryndamere one game and 2 shot a brand the next.