good price for an '05 quad cab
 

I'm looking at at Red, Quad Cab SRT-10 with 55,000 miles, 2 owners, current owner has had it for 18 months and put less then 2k miles on it. He's asking 25k, there is 8 months left in an extended warranty, has an aftermarket touchscreen radio and factory tonneau cover and rear spoiler. How much should I make an offer for? Should it be below what I want to pay, or right on the money to leave out the BS?