Check out the following IKEA link as noted below:

http://www.ikea.com/us/en/catalog/products/20159107/#/70159100

Very affordable with good selection of sizes and wood finishes/colors. Can also place multiple shelves end to end. I used as single shelf installed above flat screen television which was placed on the top of an IKEA contemporary style console cabinet. I had clear glass piece cut to size at local glass shop and placed on top of shelf to reflect light. Looks surprisingly high end for very reasonable budget. Hardware is entirely hidden. You can download installation instruction from IKEA website to see how it is easily installed. Very sturdy internal brackets and slick design.

Your storage/media cabinet/ desk is from ikea? Wow! Would you mind linking the exact pieces you used?

This wall unit was custom made by a local carpenter in Miami