I agree wholeheartedly with the article. We, too, are about to switch to Innova EVO, a wonderful grain-free kibble.

Some wallet-friendly kibbles:
I believe Kirkland makes a nice food, and they have one formula with no corn.
Diamond
Nutro
If it is just impossible to shop out of the supermarket, then Iams would probably be your best bet. I have no idea how much these foods cost as I feed the higher end of kibble (Wellness, CSFTDLS, Pinnacle, Innova, etc. types), so don't quote me on any of this

One word of caution. I would not be surprised if the Miniature schnauzer refused to eat its new food. Many people have gone around with the notion that one food fed throughout a dog's life will provide all the nutrients it needs. Thus, some dogs are practically addicted to *one* brand of food. Adjusting to a new kibble may take some time.