My top 6 would :
ETH : because let's face it, it's gonna flip BTC and become number one; it has the biggest developper community, the 150 of the Entreprise Ethereum Association aka EEA (Microsoft, JP Morgan, MasterCard, Visa, IBM etc etc), the biggest smart contracts platform etc etc
OMG : one of the most reputable development team out there working on banking the unbankable in south east Asia, working on the plasma protocol alongside the Ethereum Platform.
ZRX : the protocol for decentralized exchange and peer to peer exchange; projects are being built on top of it (RadarRelay as a recent example)
BAT : real world working Dapp using Brave browser and having contracts and adoption by some big names
MLN : asset management tokenized, good working team having Gavin Wood as advisor
ICN : real world adopted dapp making investing in crypto assets as easy as investing in ETFs and Index