Theres a new coin that has been developed where the dev's are suggesting it will be 100% anonymous, without the use of tor(anoncoin). If any dark market owners are reading I think it'd be a good idea to look into making a market using this coin once its anon technology has finished being tested and developed. Everyone should mine and buy some if interested, because if they deliver what they promise then it'll be quite popular.
https://bitcointalk.org/index.php?topic=421615.0
It'd be even better if it was fixed rate exchange with a medium spread, so we can stop worrying about fluctuating prices so much.