in my opinion, the best way is to invest right now a third of the capital in ten top altcoins, a third in bitcoin, and the remaining third to be used for purchase in case the market goes even lower.
that's a classic answer, imagine with 1,5k and you just get a small amounts of bitcoin and when you are going to the ethereum and ripple, there is no a lot of volatility that can bring you more benefits. it's much better to deal with a small coin with very huge potential just like credit. It has a chance to go to the moon or just try with another middle tier of altcoins.
I agree that under this investment scheme you will not get the big profit that a high-volatile coin can give, but you will agree that the risk will be the same in this case. However, I do not recommend investing everything in bitcoin, half of the capital invested in top altcoins can give ten times more.