$2000 amount is good , you can invest your money to ethereum and ripple which is potential coin. You can invest also the newly launched ICO but make sure you already make a search about the project to know if it's scam or legit. Depends to you where you invest your money.
Ethereum is definitely a good choice, but I would not advise Ripple - price of this coin can very easy be manipulated.
I think it is best to invest not in one coin, but in a few coins from the top 10 - check the list here:
https://coinmarketcap.com/