Looks like Coinmarket.io might end up being a scam exchange , I would also be very weary of Poloniex... trade and get your funds off ASAP. Cryptorush and swisscex appear to be ok!
Bittrex is a great Exchange. We know the founders, their background comes from security professionals (Qualys, Amazon, Blackberry). iCoin has an affiliate link to register an account, which helps gauge where the referring traffic is coming from. PLEASE GO HERE:
http://bittrex.com/?af_id=Q9u14VA2 and register an account. Bittrex has a clean UI, and seems like they have the best shot (security speaking here) so far.