My top 3 altcoins to invest are

1) Denarius, DNR (Good developer, stable price, hybrid PoW/PoS,Masternode and Fast Transactions)
2) Goacoin GOA (Steady increase,masternodes and they want to bring it that people pay with these coins in india)
3) Litecoin LTC (The price increased, new features are coming up, like paying with LTC in stores etc)