+1 for Annamaet, really high quality, small batch food. Used it, loved it. It's what my breeder who I trust and adore starts them on and is part of her food rotation. Am now using Natures Variety Instinct b/c it's a meat based kibble and I'd put us in the "extremely active" category, spending most of the day outside doing hard hiking and the like, so I wanted a higher meat protein diet.
The whole GF thing is very scary, but there's no smoking gun here that directly links GF to cardiomyopathy..if that were the case, we'd expect so many more (if not all) dogs to suffer from it as a result, That some (and only few, btw) do suggests that there are other mitigating (and still unknown) factors involved here, this is a complex issue and not as clear as the news makes it seem.
What I've found from reading the studies themselves (aside from the above) is that most GF foods substitute peas for grains, and the legumes (peas) apparently interfere with the absorption of an amino acid called taurine. Taurine is essential for heart health. Those facts aren't in dispute. What is unclear and frankly more important is why, given the same diet, some succumb while most do not. I spend more time worrying about my Vizsla generally and certainly his health and well being than I probably should, and I also spend more time researching and reading anything and everything that effects him then I should as well, and for me, the most important thing is to fed a high quality, high meat protein diet...I add fresh beef, but also salmon and chicken as a supplement, with no worries. Kinda... When I bring him in for his annual physical, I'll get a taurine level as well just to make sure.
But until they really determine the actual vulnerability in those dogs that succumb, I keep a watchful eye out and feed GF with added meat. You can rotate a high quality traditional grained kibble, there's no reason you can not give that at regular intervals. There's nothing "Wrong" with those foods, I just find that when they add grains and cereals, it's higher up on the ingredient list at the expense of meats, which are really what they needs and thrive on most.