Hecarim is my go to Jungler. Actually he might be the only jungler I have played in over 2 months. He is just so much fun. Extremely fast early game with his E + ghost and turns into unstoppable death god lategame.

You don't have to focus on his W early game at all. 1-2 ranks is enough to sustain you trough Jungle.

I usually start boots + potions (recently moved to that from cloth + 5) Then build Ninja Tabi + Philo. Then either Sheen or Aegis + sheen if I am behind, then Glacial shroud and Hexdrinker, then Shurelia's. Finally Finish Frozen Heart, Trinity and Maw and get Guardian Angel if I didn't get Aegis.