Solid long term plan!!
Perhaps pick an altcoin not so high up the ladder and take a shot with it because theres more potential for growth and its more fun. Just a suggestion.
No other coin is beneficial for investing bitcoin is best and will remain best because bitcoin allows everyone to earn and investing savings into a altcoin means losing your saving because altcoin are unknown to world, world only know about bitcoin so invest in it this will give you a lot in few days and you will feel satisfaction over this decision and I am also doing this mate this helps me to achieve high.