Too hard to choose, but off the top of my head...
HNS - Handshake - a decentralized root zone file system that allows you to buy and control tour own top level domain
DAPS - DAPSCoin - A privacy coin based off of BTC,PIVX,Monero, but better
ZEN - Horizen - another privacy coin. Not as good as DAPS technically, but more popular and easier to use.
XLM - Stellar Lumens - Basically Ripple without the problems :-)
SIA - Siacoin - decentralzed storage
I like coins associated with decentralizing the internet backbone
I like coins with masternodes because of passive income possibilities
I like XLM because it is targeted to financial system
I really like privacy coins because I think they are gonna eventually be crucial to avoid all of the worldwide governments crackdowns :-(
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ZEN and XLM has huge potential.
SIA has competition from Filecoin