I think now is a good time to buy cheap altcoin after a dump from last night.
Bitcoin is always a top choice - it's kingcoin and its fluctuations also affect altcoins.
Then you can consider ETH, LTC, LSK, XMR, STRATIS, PAY, TKN, 1ST, ....
 - ETH: September promises to be an exciting month for Ethereum. The next upgrade, Metropolis, will take place in two phases: Byzantium and Constantinople. The first upgrade of the Byzantium is scheduled to take place on September 22nd.
 -  LSK:
   +  LSK has recruited 4 new devs
   +  LSK will run the upcoming LISK CORE 1.0.0, working with SocketCluster, converting P2P from HTML to Wedsocket.......