Do yourself a favor. Nothing against the dealer here, but without any history from the previous owner on the car, you are setting yourself up with a "possible" money pit.
I bought my GN about 2 years ago, when anything under $10K was pretty much junk.
The owner of my car only had the car about 6 months, was a mustang man and new very little about its history what so ever.
He sold it to get out of it and buy another Mustang.
Every thing I do and look into on the car is a new discovery, i.e. what kind of fuel pump is in it, how old are the injectors, what kind of chip is in it.
The list goes on and on.
Just figure on replacing stuff that is old, worn out, or not the right one to begin with, and in some case's since you just dont know how old it is, replace it anyway.
I wish I had known about this site before I bought mine.
Keep looking on this site for an original, TAKEN CARE of car.
They do show up here.
If as you say the car is not running right, you are taking a big chance on it being something simple, or maybe not ?
Their ad says "runs and drives great"
HUH, what does that tell you ?
Price wise, looking strictly from the pics, ASSUMING it is nothing major to get it running correctly the price is very reasonable and appears to be in line for the car from my perspective.
Again that is dependant on why it isnt running correctly.
Your cars value is down and so is this cars value just like housing, the stock market, etc etc.
Mileage is not nearly as important (we are not talking a below 10,000 mile show car), as maintenance and just plain old replacing worn out and old parts.
Maybe put out a message on this board for "Anyone near Staunton"
who would be willing to look at this car with me ?
Good luck
Steve