I know there have been previous posts about rear DVD systems for the 5th generation. I feel the headrests are the best place for the systems because I think the overhead space will be limited between the moon roof and the dome light. My dealer says the headrest screens should not be more than 7 inches but I think that's small. I thought I read something about 9 inch headrest screens in this forum but my dealer says that will be too bulky. Any thoughts? Overhead better than headrests?