My favorite right now is XSPEC. Right now is a good time to buy because it is in a dip, with a new version coming out Jan 8th along with a website rehaul. Market cap ($113 mill) combined with a relatively low supply (20 mill) could push this coin a lot further in the next month or two. The coin has picked up some interest in the past few weeks and is still very young in terms of its potential. Check out the Slack:

http://slack.spectreproject.io/

You'll find the developer is very friendly and answers all questions about the coin's features and the community is very supportive.