In my experience, over the last five years, there isn't much room to negotiate price, at least how I use to do so. If we got a link to the car, I'm sure we could point out some things to use when negotiating. I wouldn't settle for less than 1.5K off, but I am a ruthless car buyer. You have to be prepared to walk away.
The car only has 3K miles on it. I would start with asking for $3K off. I'd meet them at my 1.5K, and then I would counter with a free extended warranty. EDIT: On top of my 1.5K off, and make it bumper to bumper.
Don't go showing a lot of emotions. When I bought my 3, I stepped out and said, "I really like the car.". I mentally beat the shit out of myself for being so careless with my tongue. I did recover though. Just be careful with what you say. Be prepared to walk away. They will call at least once.
You are starting this around tax season so the odds are a little against you.
'07 Mazda 3s - Daily Driver
'10 VW CC 2.0 - Pushing 386 WTQ and 421WHP