Intel Atom D525, 2xDDR3 (up to 4GB), NVidia ION2 GeForce GT218 GPU
This is the media player that we use for most of our installations. The reasons are:
The price for these units is $599, which is a bit more than the usual retail grade computers, however we find the overall long term costs are lower as less site visits for repairs are required.
Commercial grade hardware manufacturing is also much more congruent than retail grade equipment. In other words, this form factor will be available in quantity for quite some time. Congruency is important when you're managing many thousands of digital signs.