Burst - rising now but still undervalued. Currently at 508 sat. Will easily go til at least 1k. It has low energy hdd mining which is unique.
XVG - great for short term. The dev is really active in the announcement thread. privacy focussed.
Sys - full launch on may 22. Easy 2x potential here.
Ark - Building a crypto eco system. Extremely undervalued. Big dev team.