This topic came up in another post-with today's technology bypass a DVD player and go with an ipad or something similar in the back. It will save you the hassle of keeping up with DVD's, and is more portable if you need to take it out and use it elsewhere...flights for example. We got the iPad 2 16gb wifi and plan to get the Vogel Ringo car mount...looks slick. Here is a link to the mount.
http://www.ipadonthewall.com/ringo/
Great X5 by the way, we are going with Alpine White as well. What color interior?