Not Updated For Current Season
The build I have been going with has changed slightly due to ranked games being more demanding. So far I am still going with speed runes for the early game. As for the item purchases - I start off with the vampiric scepter, save up enough money for berserker's greaves and then finish off my first bloodthirster. I then work on the phantom dancer ... usually get zeal first then finish of dancer when I have the money. Most ranked games I have been in allow me enough time to get a 2nd bloodthirster and finish, however if the match is still going on I'll work on the 3rd bloodthirster and finish up with an Infinity Edge.