This is the custom system I have created for playing audio and video files from an SD card using a combination of products. Here are the products I used and this video will explain how I combined them.
Navtool:
http://www.navtool.com/acurarl3-1.aspx
USA SPEC PA15-ACUxI:
http://www.amazon.com/gp/product/B002...
IncrediSonic Media Player:
http://www.amazon.com/gp/product/B006...
Transcend 16GB SD Card:
http://www.amazon.com/gp/product/B003...