It depends on what you want to achieve.  Unfortunately a lot of the suggestions above are just people putting forward a coin they have invested in. But no real world use.

If you would like to see your investment grow over the next 4 weeks then I would buy MTL (Metal).  There is going to be some major announcements in the next few weeks and the patient investor will see great returns as this futuristic payment system is introduced into the mainstream population. Soon the whole world will be familiar with the Metal pay system.

Its possible MTL could double your seed funds to $1,000 within the near future.