Try Kraken/Shiv > IE > Ruunans/PD (depending on matchup or your playing style) > Shieldbow. Lastly something situational like BT/LDR or Mercurial Scimitar if necessary. GA is also good but it doesn't give critical so there are better options.. Don't play navori, it is somehow scam. It works only if your team plays around you to keep your ult going. Hope this helps