Is litecoin mining still viable?
Litecoin mining is still viable provided that you already have some of the basic hardware. The most important piece of hardware would be a high end AMD GPU, the best price to hash/performance is the 7950. Capable of achieving 630 K/hash while mining scrypt based coins. When compared to mining Bitcoins, the 7950's 630 K/hash on scrypt is more or less equal to 7.8 G/hash worth of Bitcoins. As @VampireKid said, it is definitely more profitable to mine Litecoin using a GPU than it is to mine Bitcoin directly. With that said, your current set up will cost more to run than you ever make. Consider purchasing a small amount of coins instead of paying more and mining less.
Here's what you can expect to see with the current difficulty, and exchange rate.
You can look up various GPU's performance here, https://litecoin.info/Mining_Hardware_Comparison The 660 Ti will get you only 150 K/hash, more or less equal to 1.8 G/hash of Bitcoin mining if you were to mine Litecoin then exchange it into Bitcoin.
Here's what you will see from your 660 Ti
Keep in mind, you will be spending more in electricity than you could possibly mine. Would be better to estimate how much it costs to run and use that to buy Coins directly every month or Bi-weekly. Even if you don't pay for electricity, someone else is paying for it, and they are paying much more than you're mining.
If you're unsure about how I'm comparing the Litecoin to Bitcoin I'll give a brief explanation so you can do it too.
Scrypt is much more difficult than Sha-256, lucky for us, it seems to be logarithmic. You can pretty accurately swap scrypt K/hash for sha-256 M/hash, and scrypt M/hash for Sha-256 G/hash. Using a site such as http://coinchoose.com/ You can find the profitability over Bitcoin that each coin currently has. For this I'm going by VampireKid's estimate of 1245% or 12.45x. Multiply scrypt K/hash by the profitability margin then swap the scrypt K/hash for sha-256 M/G/hash.
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