There are no "fillers" in Eukanuba, and it's pretty inaccurate to call all corn-based ingredients fillers. Eukanuba is a highly recommended company with a very long track record of excellence in producing foods that dogs thrive on, and I've had excellent personal experiences with the Large Breed Puppy formula.
Allergies to corn or other grains are exceedingly rare, and many people who think their dogs are allergic to corn have arrived at that conclusion by switching to a foods, which doesn't actually tell you which ingredient was causing your dog's problems or actually if the problem was really the ingredients in the first place. I'm not arguing against JW's personal experience, but rather against the general theme I often hear in anti-grain statements.
There's a huge, unscientific anti-grain bias out there on the web, and we don't help things by perpetuating myths that aren't grounded in good data. It's absolutely true that a dog can have a condition that makes corn a bad ingredient for him, but it's dramatically less common than people think. Most allergies are to protein sources, and many allergy-like symptoms in Goldens are actually the result of hypothyroid conditions.
I have glossy, happy, healthy dogs that have always grown up on Eukanuba LBP and then switched to a Eukanuba adult food (currently, we're using the Premium Performance). Eukanuba makes well-balanced, excellent food, and the proof is right there in the healthy animals and in their long track record.
Even if you just poke around the forum, you'll hear more stories of dogs who have runny stools and other health issues from grain free foods than you will about medically confirmed cases of grain intolerance. The vast majority of dogs process grains just fine, and it's quite healthy for them to get a certain proportion of their calories and nutrients from grains. All-meat diets often work for dogs, and many people report great success, but don't go in that direction just because some dog food websites make claims about the digestive systems of wolves.
Eukanuba LBP is specifically formulated for fast-growing breeds like Goldens in order to help with proper development, particularly of bones and joints. It's an excellent choice for a Golden puppy.
Iams, for the record, is owned by the same corporation that owns Eukanuba, and they also produce good foods, but I believe the ingredient quality is slightly lower than Eukanuba's. In a pinch, though, I'd happily feed Iams to the dogs.