What to buy to fill out a decent army?

With the new edition coming up, I'd like to fill out the Sylvaneth army that fell by the wayside due to time considerations. When I was trying to get into the game in 3e, my job became so hectic that I became lazy at home just to recover from the week's stress and try to prepare for the next.

I'm looking for the best way to get a decent army together. Granted that nothing is for sure with the new edition, but what should I try to get to prepare?

My current units: 3 Start Collecting boxes (48 dryads, 3 branchwyches, 1 ea. Treelord, ancient, spirit), 1 branchwraith, 1 Drycha, 1 box Kurnoth Hunters, 1 arch revenant, 1 Belthanos

Alarielle is happening whether she's worth fielding or not.

But what else should I look into now?