Look at the Adona racks. They combine granite with MDF and a special adhesive to (supposedly) get the best of both. I use one, and really like it, but I have no way of knowing what might be better for you. I know that it is much better that MDF, or thick slate, because I tried both. You should also definately check out Starsound Technologies. The good thing with the Starsound platforms is that you can use one that fits your CD player on your existing rack.
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