Select top 10 altcoins and diversify your investment in those coins and keep a watch on price movements and even if 1 or 2 coins pumps up then it will give you the best profits as of now I think that is the only best place to invest your bitcoins.
I think investing in top 10 altcoin wont do anything,invest only in top 3 and mainly ethereum .it will increase more and more due to plenty of project that are being made on ethereum blockchain.
My personality, if I get 0.1 BTC I want choosing 5 top altcoin. We can trade 0.02 btc /coins.
I suggest to choose exchanger which have big volume like Poloniex or Bittrex exchange.
We are know that there are having very good coins and have big volume too.