i was wondering if i should buy a certified used 2011 silverado single cab/short bed with 600 miles for 16k cash or a salvaged car or a used car like maybe a used 2009 malibu for 9k? The silverado comes with 4 years extended warranty by the way. i dont know about the malibu. but I dont wanna end up making the wrong investment. any help would be appreciated. thanks 