I don't think you need to do any research after all these responses.
You could print out your posting as back up to what you want to pay. Don't be afraid to "haggle" with the dealer. I always view it as he wants to get as much of my money as possible, and I won't allow that to happen. Know what you're talking about when you go back to the dealer, but most important, be willing to walk away.
Good luck!