Got a big question for you all here. My husband and I are looking for an '09 Malibu LTZ. By the time we added the 6cylinder, sunroof, block heater, rear power package we have found different beginning retail prices!? One car is $29,390 and the other starts out at $30,270. Obviously there's been a price increase but are there any upgrades or changes in the car itself to warrant this?