honestly, just diversify by fundamentals ie) what service/ vertical does the problem/ issue it's solving. Put some in finance, computing, platforms, storage, etc. then just forget about it. obviously keep a hefty % into the main coins btc, eth, ltc, and hedge it a bit (bcc, etc, etc.)
i think all the alt coins that are top 20 have a bright future, just give it time. it's all about portfolio management.