Why buy new??
and, yes, that's a serious question.
Other than a warranty, what are you really getting for the new price??
Sure, I know that some folks are worried about buying "someone else's mistake", but I'm not. I know what I'm looking at, and I don't buy guns sight unseen. A new gun, with a warranty doesn't mean you aren't buying a factory mistake, only that for the $ you're spending, they're obligated to fix their mistakes. Shipping should be on their dime, but sometimes, it's not.
Sometimes "other people's mistakes" are good guns at great prices. IF you know what you're doing.
A while back, I saw a 22 Luger at a local shop. Their price was about $100 less than what the average market price was. I asked about it, and they told me that they had tried to use it as a range rental, and that it was a jamm-o-matic, so they were selling it cheap. I bought it. Took it home and tested it, and indeed, they were right, about half the rounds from the first magazine jammed!!
Then I OILED IT. Ran flawlessly after that!
Used guns aren't automatically crap, some are, most aren't. Even if the seller thinks they are, they're often fine with a little TLC or some minor tinkering.
If you want a new gun, get a new gun. If you want a good gun, don't overlook the used market. And, don't take the word of the guy behind the counter as gospel, unless you know they are honest, knowledgeable firearms people. Some aren't.