http://www.naturalbalanceinc.com/dogformulas/AMPDog.html
I've still been on the "search" for a food for Falon. She just went through a 40lb bag of Pinnacle Duck & Oats but she just kept pooping in HUGE volumes (I mean HUGE). She's very active, but I wouldn't consider her a "working" dog which is why I was looking for a food in the ~27% protein range and less than 500 kcal/cup. (The NB A.M.P is 489/cup) She also doesn't have any known allergies, so protein/grain source isn't an issue.
I already bought a bag to mix with the small amount of Pinnacle I had left, but I was curious to see if anyone has tried it w/ good results?