Stable in terms of what? If we're talking about its price stability, well then, dude, there's no such thing as a stable coin. Most coins either go into a high or dive down below. The flow of coins in the market changes every time so it will be difficult for a certain that there's a coin with stable price. But if we're talking about is a stable development, then I'd say, XMR or ETH. NEO is good, too.
Yes you are right, there is no stable altcoin prices are going up. Maybe slowly and maybe there needs months too pass, but eventually most of the good altcoins now worth a lot more then in the end of this year.
I already made profit with many coins, now I think ripple is the next coins that will rise, it already did on 1$ but I believe it will rise more next year. I always point out when you invest in altcoin you need to be ready to wait before you can take good profit. I learned that everything is in waiting long enough.
