I think you should put some in bitcoin and another amount in growing altcoins as it grow rapidly too...
Nice idea but choose a choice an altcoin which have a potential because there is possibilites that you can loose your capital. Investing in bitcioin are the best with low risk
for longer investment bitcoin is the best one, as years already proven how bitcoin evolves, the more you can hold it the more earnings that you will able to gain, even fluctuations keep happening but if you are looking for the longer time you will see good results so its a choice when you are looking for a good investment.