Right now three of my dogs are getting a 40/60 mix of Taste of the Wild High Prairie and Diamond Naturals Extreme Athlete. The other is getting Earthborn Holistic Primitive Natural 'cause he's speshul. They always get fish oil no matter what they are eating.
I usually feed homemade whole-foods (chicken quarters, beef heart and liver, beef and pork meat, occasional turkey bits, eggs, rice, and oats, various veggies in the warmer months), but I'm short on cash right now and my refrigerator is not running so they get kibble.
I only feed kibbles without wheat or corn (speshul dog has serious problems with these), preferably few if any peas (speshul dog also has problems with these), and with protein at 30% or higher and fat no lower than 15%. I'll use both grain-free and grain-inclusive kibbles and frequently add things like eggs or ground meats.
Brands I like are Taste of the Wild, Diamond Naturals (only Extreme Athlete), Merrick, EVO, Earthborn Holistics, and Nature's Variety Instinct.