I would suggest the coins that will be listed on Coinbase. These are more likely to get better in the long term. Or you can always invest in ICOs, just make sure you pick the ones that will do well in the future or may be used by the masses.
Coinbase said in a twitter post that it doesnt intend to add new coins to its platform anytime soon, though they also posted a while ago about adding some new coins. But, we dont know anything for sure which coins they will be adding and when until they make some official announcement about it. Its better to invest in coins that are well established in the market. I wouldnt bet my money on an ICO for long term.