It depends on the country you come from and/or the currency you use because exchanges don't use all currencies possible pairs as you guess. Some use only EUR/USD, some use EUR/GBP/USD/JPY and so on. For EURO Bitstamp and Kraken are good, Coinbase for GBP. But since you didn't say much...
5. Bittrex
These are the exchangers listed on the link you have given. Just want to ask where you from? Each exchange do have supported countries just take a look for that info.
Bittrex uses fiat currencies?