Im hesitant to use Coinbase. I have heard lots of horror stories where they seize or shut down accounts.
They are trying to impress the US Gov right now big time.
The fear may be unfounded though.
Ill check them out

I have heard stories like this too many times:
http://www.reddit.com/r/CoinBase/comments/32k95v/coinbase_is_canceling_my_ordersagain/
http://www.reddit.com/r/CoinBase/comments/2zho6z/fyi_it_took_5_days_for_support_to_respond/
http://www.reddit.com/r/CoinBase/comments/2y76yu/stay_away_from_coinbase/
http://www.reddit.com/r/CoinBase/comments/339jma/a_year_later_no_resolution/
Also there is this guy:
https://twitter.com/Coinbase_Victim