Watch the volume on BLK, if it starts to move up on the Polo list or on forward on the bittrex pages i think this one could really move. Here is my reasoning:
A. It is a long time innovator and used to have a huge community following (blackcoin devs invented proof of stake).
B. Its btc price is close to ATL's right now and its usd price is climbing towards previous highs this summer (0.70ish, currently $0.38).
C. It is listed on Bittrex and Poloniex, altcoin exchanges that are US based and generally trusted by the alt trading community.
If this breaks the 2500 mark, it should be a quick trip to 4500. If these levels hold, look to 7000.
These are just some thoughts not investment advice. Good luck trading.