ok, so now that GMC is offering $6,000 cash back on leftover 2007 2500HD trucks, i was thinking about trading in the 1500 for a new better one. also, my part time job offers a decent discount on new trucks as well. I was looking at a truck as follows: New 2007 2500HD regular cab 6.0L V8 Automatic transmission, 4x4 A/C, power locks, Onstar, Cruise Control Towing Mirrors Cloth Seats, Vinyl floor the truck's MSRP is $28,000 the total price with the $6k cash back and my discount through work is about $19,500. This truck is pretty basic, power locks, but not windows, no CD player(i'll add it myself) it has onstar and wheel mounted audio controls. any suggestions on what other options i might like down the road? or any comments on the vehicle i'm about to get?