Why not negotiate lower? All the dealer can say is no. Plus, I am sure there are plenty of dealers in your area. With that said, it appears you are getting a good deal on the car for an '05. Go to edmunds.com to check invoice prices. Invoice is about $35,520 on that car so the dealer is making close to $1000 profit.
Watch "doc fees" and other add on's as well. I got VPP on my '05 car so there was no negotiation on the price. However, I did get the dealer to cut the "doc fee" in half and throw in some wheel locks.
P.S. It is INFINITI - not INFINITY.
