I know that the OP didn't post here for an evaluation of her choice to purchase a dog, but I want to throw my two cents in here. I must say, as a recent adopter of an older dog, I do understand why people want puppies. Older dogs from shelters can come with special challenges that puppies usually don't have. I adopted a two year old beagle from the pound, and he has severe separation anxiety issues. I have no idea what his previous life was like before I met him; I only know that he was picked up as a stray and was in the shelter a month before I got him. As a result of his emotional trauma, I cannot leave him alone without him panicking. Right now, I have to keep him in his crate when I am not home, otherwise he will destroy my apartment. He will tear apart anything I leave in the crate, so the only thing he can have in his crate with him is a Kong toy, which is indestructible. He whines and barks while he is in the crate; I can hear him in the parking lot!
I researched breed rescue groups, but almost none of them would adopt to someone without a fenced yard, which is ludicrous, because you simply cannot keep a beagle locked up alone in the backyard; they will dig and get loose. I finally made the decision to search the pounds, because those animals are most in need. Everyone said adopting an older dog would be easier than getting a puppy, especially for a first-time dog owner, but now, I disagree. Of course, I love him to bits and am committed to keeping him through thick and thin, and I don't regret my choice, but there are challenges that I wasn't necessarily aware of beforehand.
Of course, how a puppy is raised at a breeder is crucial, and I second the recommendation for Cesar Millan's books. Research, research, research, and don't base your purchase decision on the cost of the dog. Good luck with whatever you decide!