Just check the original post in this thread for the feats I take. That's what I would suggest. If you're running human 15c/3p/2f you'll have an extra feat to burn. And that's why I prefer 15c/4p/1f. There's really nothing meaningful to spend that last feat on and I'd rather have tier 4 stuff from KoTC or SaD instead. I guess precision or epic DR if you already have all the feats in my original post.
Yes, power attack and precision cannot be used together.