The buyer should be the party driving the purchase. If he has something that you want to buy, then negotiate with him and reach an agreement. If they won't deal, then move on.
Be sure to have that Crossfire, or any other used car, fully checked out by your own mechanic before you intiate any negotiation.
A 9 year old car is pretty old for financing. Any lender financing it will charge high interest. Consider saving enough to pay cash.