Building nature's prophet?

I love nature's prophet. I first played him 2 days ago when I drew him as a random, and had so much fun I decided to stick with the hero for a while. He's a blast to play; definitely the type of playstyle I enjoy.

I'm a little unsure of how to build him though, and what to build him around. Should I be going for damage? (playing the game as a pusher / farmer and eventually dealing huge damage lategame). Or should I go for the quicker hex / stun route? (sheepstick / orchid). Or a mix of both?

So far my item build is usually: full ring + 2 clarities to jungle. Use the courier to gradually assemble power treads while purchasing enough clarities to keep making treants, then complete wand.

I'm unsure of what to do at this point. Should I go for a damage item like a desolator or Daedulus, or rush an orchid / scythe. I've usually been going desolator ---> orchid --> daedulus --> sheepstick. If I'm playing vs a ganker with mobility that's hard to run away from (Night Stalker, CK, any team with a wisp) I usually try to get orchid first to feel safer when I'm pushing lanes. Also where does desolator rank as far as cost effectiveness goes for damage items? I've heard some people tell me to get it, and others tell me it's a mediocre damage item for its cost.

Thanks for any help!