You can find some good feedbacks on reddit /r/CryptoCurrency, and here now thx Steemit ;-)
Dig deeper on the coin's blog/forum and to the bottom on their slack channel. Catch news before price pump with rss feed aggregator like: http://feedly.com
Follow coins' moves with http://www.polonibox.com (where you can search in the trollbox of poloniex).
Personally got some interests for: Cloud storage coin: Sia/Storj, Social: Steem/Synereo, Privacy: Dash/Monero, Smart Contract: Ethereum, Counterparty/Rootstock.