+{s:bonus_tooltip_health_damage}% Life Break Damage : Both talents are situational: choose based on your own feelings on what's happening in the game
Core
~5-8 min
Your essential game-winning item. Cheap cost effective stats, armor and toggle ability in theory can make you unkillable early on.
~13-19 min
Additional HP and slow, but most importantly - miss chance and disarm, that allow you to continue showballing.
Your main threats are disables. If enemy has a lot of them, BKB may help you focus most important targets.
Situational Early
Before Armlet of Mordiggian
Before Armlet of Mordiggian
Solve mobility issues with it or get to backlines of enemy formation (to kill enemies like sniper)
Before Aghanim's Scepter
Situational
High attack speed and pure damage. Disgusting.
Usually BKB is better in terms of dealing with disables, but it may help against some scary stuff like DOOM
Usually you don't even need to upgrade your boots. Altho, if you 100% sure you're not going to lategame, you may want to go for greaves because of ridiculous HP regen aura under 20% HP and strong aura for your team in general.