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Build Guide by SreymNagol
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Also if you are willing to lose a bit of speed then you could always drop the boots and pick up something with more damage. The passive move speed on the phantom dancers is enough to get by.
You may also, if you have trouble staying behind creeps or teammates , want to build a health/resistance item. For health i recommend Warmong's and for resistance I suggest Guardian's Angel (because nothing is more annoying than an Ashe with two lives)
Pro- End game this build will allow you to 1v1 almost anyone and, with practice, it works very well in 1v2s.
Con- early game, since you build phantom dancer first, it has very low damage. The runes and masteries will help you a bit but other champions will most likely do more damage than you early game.