Skycoin seems very interesting. It is at 100M market cap. It is fairly new and unknown. I guess some time will pass before people can understand what it is, though. Same thing as Raiden.
I am hearing a lot about Skycoin too. I think the main reason why it has gained so much interest is the fact that has a high market cap as supposed to other altcoins that even though they have higher value or better market movement going their way, their cap is not so much which means only a few may hold and invest with it. However, since the premise of your questions is "good options", I would say that I would choose those "strong" altcoins around like Eth, Ripple, and Waves. I call them strong because they have endured the bitcoin surge this past few months without experiencing significant price dump, or worse, being killed off like other altcoins.