Assuming this tractor was just a bad fit for the previous owner? Did that particular dealer sell the tractor new? Was there a service record for any issues or repairs at that shop?
You'd save about $1200 on that package. The question will be the interest charged on it, if financed. I am going to assume around 3.5%???
Total up the finance charges and see if they would total more than a grand. (cannot predict how long a term you'd want to go.) Deduct that interest from your $1200 savings.
If the total savings is only $400, I'd go new at zero. That's just me.
If cash, then you pocket the savings and smile. BTW, push him hard for another $500 off that. Trust me, he NEEDS to move that piece.