I'd go for 1337 OMC. It's only $3.5 or so.
Since you have to print the actual keys onto the coin, it's a possibility that you could keep the private keys and later take OMC from the user. That's one huge security / trust risk that needs to be addressed. Personally I'd only use this as a novelty item. I wouldn't keep any more than a few dollars of OMC on it just for sake of security and I'd advise others to do the same.
Also, how are we even supposed to use the coin as a wallet? There is only sending support to QR codes on Android right now. Anyone wanting to send coins would have to use a 3rd party app to scan the private key and then enter it into their wallet. At that point it wouldn't really be a paper wallet anymore.
Since you have to print the actual keys onto the coin, it's a possibility that you could keep the private keys and later take OMC from the user. That's one huge security / trust risk that needs to be addressed. Personally I'd only use this as a novelty item. I wouldn't keep any more than a few dollars of OMC on it just for sake of security and I'd advise others to do the same.
Also, how are we even supposed to use the coin as a wallet? There is only sending support to QR codes on Android right now. Anyone wanting to send coins would have to use a 3rd party app to scan the private key and then enter it into their wallet. At that point it wouldn't really be a paper wallet anymore.