OP, is your goal to get rich quick or long term investment?
If it's the latter, don't look beyond Top 20 or even Top 10 at coinmarketcap.com
As for getting rich quick, it's a gamble, don't listen to anyone, invent your own way of losing money.
Good question.
I don't believe in quick rich scemes.
Just wanting to test some of the coins and see how they do compared to BTC
I believe the future is with crypto currencies!
Most coins are either in bear market or at best moving sideways now, including Bitcoin. This situation could last another year, as adoption is not happening as fast as anticipated. If you want to try something really different, try
NXT, you won't find anything more different from BTC and having as many features, check out NXT Asset exchange (you can view some of the traded assets in coinmarketcap on the 'assets' tab). There are a few less tested and/or less popular alternatives like
Bitshares, Qora, NEM (to be released in a couple of weeks). Be sure to check out
Nxtty (mobile secure app to be merged with social networking, keyword 'nxtty' in google play) and receive a bonus for signup. These above are so called Proof-of-stake cryptos.
Dogecoin is not a bad idea if you're against Proof-of-stake (maybe you are not, but some folks are - they are mostly miners or early bitcoin adopters, if you're neither of those, you should be ok with Proof-of-stake).
GEMS is a competitor of Nxtty, but hasn't launched yet, you might want to check out their thread and be ready when they make their announcement. But don't bet a farm on of all these, get educated, read a lot and put in a little bit of money first, don't ever invest more than you're comfortable to lose. Hope this is helpful. Oh yes, and don't trust anyone, including me, do your own research and try cryptos by yourself.