Dear friend,
In really, it is so hard to give you an advice about issue you ask. It is hard because there are too many coin in the currency market now. It depend on what information you have about each coin, financial possibility, plan to develop in the future....
I think you must study carefully to find a coin which you think  good base on what you collect about it.
I am not a expert to remind you a good coin for investment, I just say with you what I think about your issue.