To sort this things out, may we know what is your preferred coin to be traded? There are several exchanges around (almost majority) that have great numbers of listed coins. Mentioning those exchanges will just gave you more options so we are sorting things out so that it may be closed to your preference.

You can go on with the big and reputable exchanges (e.g Bittrex, Binance, Poloniex) as no doubt volumes here are great but maybe your preferred coins are not listed there that's why Im asking if you already have some preferred coins to be traded.