Well if i were you i would not put all of my money into only one coin. Ethereum will be good you are right but you can make much profit if you put your split your investments in couple of high potential coins.
Placing all the budget in one coin is a horrible idea, and this is very risky. Never do it, try to find at least couple of promising altcoins from the major ones, not the ico ones. This is the most suitable way of investing in altcoins, not only ether.