Why not zerocoin? Any unproven tech will need to be reviewed by cryptographic authority and we know that is not so easy.
I'll read Zerocoin whitepaper tomorrow and will think. Today is too late, time to drink milk and go to bed soon.
In my search for a crypto algo reviewer, I was referred to a crypto expert named Matt Green. He did get back to me yesterday and said he was currently advising Zerocoin but might have some time to review our code. I did mention to him that we were interested in implementing Zerocoin with Nxt POS and would like him to review our code if he could. Here is his blog, seems like a really nice guy;
http://blog.cryptographyengineering.com/Also, I've had a hard time getting crypto people to review the code, they would rather review a protocol design document instead of code.
zerocash is scheduled to be released in May as altcoin.