All depends on how much you want to spend. Media blasting should only be done by someone who paints/powder coats bike frames. I've got a guy who will do it for $40 who does powder coating of bikes.
[MENTION=457988]Hoopdriver[/MENTION]'s method sounds as good as you need. Dings can be filled with JB weld, let it set overnight, then carefully file/sand it round.
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