Just a warning - when I applied for pre-approval, I wasn't expecting more than $250K. When they did process the pre-approval, I asked how much (thinking they'd lowball me) I could get - I nearly choked when he said, "You're pre-approved for up to $475K".
I told the guy there was no way I could afford to pay that back in one lifetime, he laughed and said that not many realize that & get themselves buried in debt.
Also, if you've never gone through a closing, be prepared to sign your name so many times that eventually it will just be a couple straight lines.