Do you already have some ether or bitcoin? I think those should actually become a priority above all the others, but narrowing your choices to just those two, then I would say litecoin. I don't even consider ripple a good investment to be honest, and for me it doesn't really matter if it will ever give your profit or not, because in the long run (and you did mention at least 1 year) I believe that everyone will understand that the ripple token itself, has no value.

Most people don't even know what that token is for, but you need to know one thing about it. The token is just a feature of the network, and it's used to prevent an attack, nothing else. It was never meant to be to valuable, or scarce. That token is meant to be destroyed on every tx, and at a very low rate, so that the network continues to work, even if it ever gets mass adoption from banks. So you will always have tons of tokens, that will only be valuable enough to protect the network, but never valuable enough to ever work as a good investment.