Armlet of Mordiggian is the item to get on Huskar. I recommend rushing Armlet directly after Boots of Speed for best results. I'm not a fan of Urn of Shadows on Huskar (it delays your Armlet of Mordiggian and provides unnecessary Mana Regeneration), but the option exists if you can't stand having those two Gauntlets of Strength sit cold turkey until your Core Items are done.
Post Armlet of Mordiggian, purchase Power Treads -> Helm of the Dominator -> Black King Bar and/or Heaven's Halberd. Your choice of Black King Bar or Heaven's Halberd should be carefully selected in response to enemy team's composition. If the enemy has both heavy Magic and strong right clickers (or hybrid carries such as Morphling, Luna and Shadow Fiend) then purchasing both Black King Bar and Heaven's Halberd is encouraged.
From there, the best luxuries for Huskar tend to be Heart of Tarrasque and Satanic, mostly because +Strength is the best itemization available to Huskar. Win or lose, most games should be over by the point you have Heart of Tarrasque and Satanic. If not, you should look into one of Assault Cuirass (if your team has other carries and no Assault Cuirass yet), Monkey King Bar (if the enemy team has any of Heaven's Halberd, Butterfly, Phantom Assassin, Riki, Brewmaster or Windrunner) or Daedalus (if none of the other conditions apply and you'd like to crit for 1000+).
Remade the step-by-step sequence in "Gameplay" into a list. Also (and more importantly), replays are coming soon!
Sections ("Skills, "Items, "Gameplay") upgraded into Chapters.
If you have any comments, concerns or suggestions regarding my guide, I encourage you to PM them me or post them below.