Are the people mentioning Litecoin insane or just bagholders? I could not think of a worse investment (unless you're shorting).
Stick to BTC and if you have to choose an alt, go with NXT. Amazing development and community.
Historically speaking, Litecoin has tended to follow Bitcoin's price trajectory but in a much more exaggerated manner (actually this is true for most altcoins too). When Bitcoin went from $13 to $1,200 in 2013 (i.e. a 100x difference), Litecoin went from $0.07 to $48 in the same period (i.e. a 700x difference). When Bitcoin went from $900 to $300 in 2014 (i.e. a 66% drop in value), Litecoin went from $20 to $2 (i.e. a 90% drop in value).
Of course, there is no guarantee that history will repeat itself, and it's possible that LTC prices will continue to fall despite a rising BTC price (Certainly the altcoin market is a lot more competitive now vs. 2011-2013 and the introduction of scrypt ASICs has eliminated one of Litecoin's main benefits over Bitcoin).
I myself dont believe that Litecoin will grow up again to 10$ and more like it was on 2014. And that the Bitcoin grow up again to 1000$+ beacause there made to much mistakes and betrayal of trust to much steal of coins scam and stuff. I think the people have fear to invest beacause what you do with BTC ore LTC you just trading there are no other use i think by only 21 milion coins to get this under people. And people are skeptical to invest after this bashing from media bad headlines. I think this crypto currency will come but not with bitcoin or other altcoins. Maybe with a new edition and officially from Banks with big support.