Wild Growth, or Flourish as it was previously known by, seems pretty amazing to me. The fact that I now have a dependable AoE heal at my disposal is great, even though at 35% base mana it is a bit expensive. Also (I know, I couldn't just limit myslef to one "best" talent) the new Tier 1-Tier 3 talents for balance are pretty nice; especially attractive is Nature's Splendor. It makes my already extremely mana effecient HoTs even more effecient.
I'm not quite sure what to think of the Eclipse talent. Given the on-critical hit effect and the 30 sec cooldown, it would be very difficult to make a spell rotaion based on the effect of this talent. Plus, I would much rather put talent points into the resto tree to get the re-vamped Omen of Clarity.