Would like to add a DVD player to the overhead. Any units to avoid? Install insights? Thanks.

 

Check w/ Crutchfield. Might consider headrest units for ease of install and some can play separately.

 

I went with Kenwood's DDX318. Low price point that actually supports the rear watching a movie while the front listens to the radio. Got it from Crutchfield, along with the gmlan (half-price when bought together with the stereo) and steering wheel control interfaces. I picked up the head rest monitors elsewhere.