I have built and built and built 2500's on the GM Family and Friends website, which I get. Can't find a dealer to honor it, but I can get it eventually I guess. My question is......I have built the SLE, SLT and AT4. To get the SLE lie I want it with the 20' wheels and upgrades its about $51,000. I'd still have to add aftermarket leather for another $1500. The SLT like I want is $56,****** for my cost. The BASE model AT4 with the 20's is about the same price. Im sure the AT4 will have better resale value but what all does the BASE AT4 not have that a fairly loaded SLT has? Neither are equipped with the sunroof. Does the BASE AT4 have BOSE? What options will it not have that the SLT will have? THANKS. By the way, Iike the looks of both the SLT and AT4 so I'm fine with either on outside appearance. THANKS AGAIN