Any advice would be great.
If you are doing this as a hobby that's fine but if you expect to make money out of it then you will be disappointed.
If you must have LTC buy it on btc-e, it's cheap now. Just be aware that there is a pretty good chance it's going to continue downwards, not upwards.
It isnt going to continue down.
Thats why it's a lose/lose situation. If it continues down you will lose money. If if doesn't continue down, and instead increases, then invested GPU miners with large hash-power will jump onto LTC (as they did before when the value was higher) and drive the difficulty sky high way before you would have a chance at recouping your investment. Thats why it's lose/lose. You won't make your money back either way.
If you buy 3x 6950's for about $700 lets say, at the current "LOW" hash rate you'd mine about 60 coins per day. Which lets assume $.07 per LTC is $4.2 per day IF there is enough volume to buy that many coins at a constant rate (big assumption) meaning 166 days to pay back JUST the GPUS- not the rest of the computer, nor your power costs (which are higher when mining LTC). Or you could buy 10,000 LTC for $700, and if the value really does stop dropping as you hope, and goes up, lets say to be wildy optimistic- DOUBLES in the next 166 days. You would have a profit of $700 USD having bought the LTC outright. With building a rig you would have paid off the GPU's but you would still be in the hole for your power costs, and the rest of your computer.
See what I mean? It could be a labor of love, sure, but by any economic measure, its a hole you're going to throw money into.
EDIT: Hmm, to not be a small miner I would say you would have to buy at least 50 GPUS. But it doesn't make sense. Unless you have free industrial power, your electricity bill would be in the thousands of $$$ each month.
Even then, if you did all that, you would be competing against other big miners who have long since paid off their investment of GPUS and who would mine LTC as long as they could sell the LTC to cover their power bills. Which means they would be seriously depressing the LTC market. Even as we speak, BTC-E is down and there is effectively no place to sell your LTC in any serious volume. Not even BTC has seriously LTC volume anymore. Which means your competition, which has lower over head then you would have, can afford to sell LTC cheaper then you can, which means they will always depress the price below what you can economically afford.
I know it's sad, but it's the truth. You could try one of the other alt-coins that have low hash rates, but it's a labor of love and speculation. LTC unfortunately is past the speculative mining phase, but not quite at the big time.