I tried to signup with the suggested services.
So far Poloniex seems to be the best, however, they don't have any option to withdraw the money to an bank account in USD or EUR, that is what kraken has.
Do you guys know a reliable and trustworthy service that has a trading platform as Poloniex & Kraken but also let you withdraw the BTC in EUR or USD to a bank account ?
What about trying bitstamp or bitfinex both are leading bitcoin/usd markets and they are supporting fiat deposit and withdraw functionalities. Coinsbank could be another reliable and highly reputed services but with them you will be able to withdraw your funds through their debit card services.