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Berzerker's Greaves Bloodthirster TriForce Last Whisper Infinity Edge Defensive item
This is how I would path that build. I get Bloodthirster first because spellblade applies lifesteal to itself IIRC. Last Whisper is next because people will have armor when you've finished BT and Triforce.
I like to get Infinity Edge over the defensive item so that I deal more damage (like a marksman should be doing), but you could opt for your defensive item if you are getting focused down.
I will also state that this build is optimal when fed or in a team comp around poke. You will also lose out on attack speed, meaning the marksman with phantom dancer late game will beat you in a straight 1v1. Just poke them down with Q or get someone to stun them so you can get them before they get you.