Pay for Profit
While slightly expensive, this kibble is quite amazing. More physical and mental energy, shinier fur - all your regular benefits. I do recommend.
Also, the organic quality in the food actually makes the dog feel satisfied after eating a smaller portion than with the non-organic options.
If it's too expensive to simply stick to this organic grain-free variety, I guess, it's possible to combine with a "filler" kibble, such as one of the vegan/vegetarian options. It might even out the expenses.