Of course the -best- would be one of the Alpine units from the era. They all look good with their green illumination that matches the Miata. The one that's long been championed as the best cd player ever, and was even re-released for it's 25th anniversary would be the 7909. Though it didn't come with USB input, and was a pullout, it can be converted to fixed install and aux input. That's what I have waiting to go in my Miata.
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7909s are sweet for sure. Do you have an original, or the re-issue with the copper chassis?