Bittrex, Hit-Btc, BitZ, Coinbene, Okex, Huobi, bithumb. all legit exchanges with known coins in their market. IDAX has some weird coins on their side, besides EOS and ETH. Their hole volume comes mostly from one coin. Don´t know why you would go with IDAX in the first place if you have the funding for a good exchange. You just need one good at the start, more will come down the road.