John K is recommend. However, he has a lot of demand and may be busy which could reflect on the time which the money is stored and released. There are different alternatives. However, you should read all the reviews and judge for yourself. If John K is available and he says he can be, then you should go with him. However, these are the other alternatives (Be careful always and judge for yourself):
Dabs -
https://bitcointalk.org/index.php?topic=234939.0Dabs is also a very respected member.
MMO Escrow -
https://bitcointalk.org/index.php?topic=133985.0Also, have done very high amounts.