I build him as an area DPSer and semi carry. First item is always Vanguard followed by a boot of choice (usually PT str). You may start ganking top/bot after those 2 items, of course if you got a good rune / correct multiplier you may go earlier
.. After those two I would start aiming for radi, followed by Plate Mail --> Dagger --> Shiva. My game usually ends there.
Justification : VG is for imba tanking, Radi is gotten for the sparkles (helping you farm is a bonus plus), Plate Mail first is to fix your armor, Dagger is to help you initiate (the optimal creep is always always Centaur or Troll, only get wolf if it's superlate game), Shiva is for bonus AOE damage.
No matter how badly my game started, I never fail to reach the Plate Mail. Doom is too good a farmer (even tho you don't afk farm).