There are two standout candidates for me - Spectrecoin and Neo. Spectrecoin is THE most holistic privacy coin but at a fraction of the price of Monero at present (under 1%). Once the marketing kicks in the potential is massive.

Neo is simply the smartest coin out there, ICO friendly, excellent eco system and pays gas dividends for holding in a Neon wallet and scratching your butt (about 6-7% dividend per year)