Spectrecoin (XSPEC) would be a prime candidate.  Privacy coins are the wave of the future, and Spectrecoin has some of the most robust privacy and anonymity technology available.

There are only around 21 million in circulation, yet the price is still well under $1.  This is not likely to remain the case for long.

This is one coin which should easily reach $5-10 within a year, and it would still be undervalued, imo.

You can find out more about this hidden gem here: http://coinwiki.info/en/SpectreCoin