To change my currencies I do not complicate my life, I have only three exchanges for that and I use my desk wallets to store my coins, the exchange I use most is Tradesatoshi for having a low limit to operate and many shitcoin, in addition to strong currencies.   

The currencies depend on the developers of the project and the community that has it, but it must also be in exchanges where it is possible to be able to commercialize them, talk to the people of Tradesatoshi, the listing fee is not high and there are good currencies to do co-commerce.