Good afternoon. I am looking to purchase a new truck very soon. I have always had Silverado 1500s and have thought about a Ram 2500 6.7 but after driving it am taking a look at the 2500hd duramax. My question is what is a realistic amount to be able to negotiate off the window sticker of $61,910. I know about the $3500 rebate and the $1000 Costco deal. Thanks in advance.