DeepOnion has just been released on the exchange and is set to do exceptionally well. Trezar is also one to look out for. Neo is a definite and I'd say NXS to but it'll need a while to recover. (Then again, which alt doesn't at the moment!?)

As the rest of the guys have said though it's about really understanding the coin your investing in and also analysing the market. There's never 100% certainty though.