The Miyamoto signed one is the Legend of Zelda SP, regular edition. It's the same as the Zelda SP, but with documents verifying that Miyamoto signed it. There was one on ebay 2 months ago.. went for $530.
While I'm on the topic of Nintendo, I really HATE how they spew out different versions/bundles seemingly every single month. It's impossible to have all of them unless if you have an nice stack of cash lying around!