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As for metal case or not, here's what people have told me:
Metal case cuts back on EMI to the outside world. Would your cell phone work while driving? What are you doing on the phone while driving? Text that foul temptress later.
Hmm... Also, would the heatsink being attached to the heat spreader be enough to keep it cool inside, even though it would be surrounded by an insulating material like Lexan? I have no idea! Maybe!
Hmm... I know how to go to Home Depot and make a lexan box pretty friggin cheap, so that's always an option. In that case, Mounting "heat sink down" might be better.
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