KristiKelly offered a lot of choices. Dog food is something I'm becoming more passionate about, so I apologize in advance =)
Purina, Science Diet, Euckanuba, Iams, etc are YUCKY YUCKY YUCKY foods. Don't feed your baby that, please. THere are so much better foods out there at lower cost. Many people feed that junk to save money, and then they end up feeding twice what you would feed on a GOOD food, so not saving any money at all!
THings to look for:
NO CORN - this is a cheap cheap filler that dogs cannot digest. Foods that use corn in anyway are doing it to save themselves money and are not doing your dog any good. Besides, this is a major allergy, many many dogs are allergic to corn and their owners don't even know it. Causes skin irritants, dry skin, etc. Corn gluten is the same as corn, just relabeled to trick the consumer.
NO BYPRODUCTS - you don't want to know.
THREE SOURCES OF PROTEIN in the top few ingredients - that is, if your dog doesn't have an existing allergy and need a lamb only meal, or something. It's okay if it says Chicken Meal, or just Chicken - but not Chicken ByProduct.
TOP THREE INGREDIENTS SHOULD HAVE 2 PROTEIN AND 1 GOOD FILLER at minimum - your main ingredient should not be rice, grain, or corn.
That being said, there are few foods that are truly good quality, and even fewer at your local pet store. The family owned small stores usually carry these items becuase those are people that care more about animals then the almighty dollar, and want to stock and recommend good things. KristiKelly already listed some goods one - Chicken Soup for the Puppy Lovers Soul is good, inexpensive (cheaper than most of those icky brands listed above) and is relatively easy to find. They hvae a store locator on their website. Not carried by a national chain, but at most feed stores. I had 15 stores in my dinky city that carried it. I am feeding Natural Balance now, which is better than Chicken Soup and cheaper than the yucky foods listed above. I find it at PetCo (but not at PetsMart) - hidden away, you'll have to look for it. They have several lines, but their basic all level food is quality enough for puppies and adults - you don't need a puppy food on good food, btw. Harley LOVES this food, and the kibble is small enough for a wee one to eat. With the canned food, you can SEE pieces of vegetables and meat in it, so impressive!
I used to feed Nutro Ultra, but Natural Balance is cheaper and better - Nutro has 3 diff lines, their lower two are not very good BUT are better than Iams, Euckanuba, etc - but their Ultra is pretty good, but overpriced. Save yourself $ and go with a good food. Your pup will eat a lot less and poop a lot less because it's quality ingredients and not cheap fillers.
The big names in pet food spend millions trying to convince us that their food is good for them, just read the bag - it's right there in the ingredents what junk they are selling us. Good luck, and congrats on your new baby!!!!!!!