Hey guys, I am looking to buy a 2008 Chevrolet Silverado 2500HD with the 6.6 Dmax, Ally Transmission. It is an LT Crew Cab has the Z71 package 2WD. The truck has some miles though, it has 135,000. They are asking 20,000 Flat. What do you guys think? This will be the first time I purchase a diesel and I am a Chevy guy so I will stick with the Dmax, I just wanted to input from everyone. What are yalls' thoughts? Is the price reasonable?