I'm hesitant to involve coinbase since they've cut off gambling transactions. I agree that an exchange is better for me, i just don't know enough about this to trust a person to person exchange (even if that person has high reviews)
What caused them do so? This worries me because I use Coinbase and I gamble daily.
They're desperate to appear whiter than white. There's a lot of people who are claiming problems so look into covering your tracks.
https://www.reddit.com/r/poker/comments/2dxuqw/be_careful_seals_users_coinbase_has_blocked_me/