And what about new trading platforms like ModulTrade? They are already on ICO and the team is great. I've tried their prototype, it's a great system!
ModulTrade is new and as far as I am concerned, there is no trading site that is trustable as long as they are centralized and you have no single way of having a full hold of your account which is why you should never trade what you cannot afford to lose on any trading site. Until we start having decentralized trading platform with BTC pairs, then we will just have to stick with the ones we have for now.
I had the same problem on Bittrex and stop using (my money is still in there though), now I am using HitBtc and Binance. No problme so far, Binance is faster and i like it better now.
The best is just to do their verification so as to prevent any loss and that is still not a guarantee that anything does not happen to that exchange in the future, but at least, one is guaranteed a little bit of not getting one's account closed like bittrex did without any information. Binance is really a very good platform and I hope they do not end up like any other exchange as they start well and end up messing up in the long run.