I recommend you to invest in currencies like ETH and Waves for now.
I think maybe you can buy ico coins.
long-term or short-term investment. all depends on your wishes. if you want long-term investment in my opinion bitcoin, ethereum is a coin that is suitable for the long term. but if it is short term, etc., LTC and not suitable for short-term investments.
My choices too, Bitcoin and Ethereum are also my choices and I suggest to people are well to start long term investment with the Bitcoin which is most profitable after which Ethereum keeps second position. Besides these two productive investors will go for both long term with Bitcoin and Ethereum while short term with Litecoin and Neo may also take position here resulting the overall profit as a huge profit.