I'm not a huge fan of Natural Perfection. If you do use it, I'd suggest going 1/3 on it and putting the other point into Nature's Grace (you're boosting crit, so you might as well take advantage of it). Otherwise, one of the HT talents wouldn't be a terrible idea.
Well, there's a difference between "not terrible" and "good"
Improved Tranquility, even one point of it, makes Tranquility a twice per boss fight spell instead of a once per boss fight spell. I kind of like it for leveling (but wouldn't really retain it for raiding).
Nature's Grace really is a good buy considering Regrowth will have a minimum 50% crit chance. Right now, it's looking like it'll become a staple healing spell.
Why not have nature's grace? And Replenish and Natural Perfection is a worthless talent. Gift of the Earthmother isn't that great and neither is arguably, Wild Growth. If you want that craptastic aoe heal, go for it, I still think resto shammies and holy priests will take us on aoe healing. If I were you, I'd put talents in imp Tranquility and take out of replenish and natural perfection and head to the balance tree. I personally will be taking points out of wild growth and gift of the earthmother for capping out brambles, nature's grace, and the +spell power for intellect talent.