Just bought this 9" Panasonic TV/VCR combo with AC/DC capability and found it fits just perfect between two front seats on arm rest area on my X5, making it a great(& cheap also, compared to $2000 built-in entertainment system) entertainment system for rear passengers (esp kids). And even better I can take it to the motel room and watch my own video or play games.
They have a cheaper Samsung model, but personally, I prefer Panasonic cause it has better picture quality and include the 12V plug cable.