best thing you can buy, is a wattmeter (~15USD /10€).
It will show you if mining is worth or not.
In Germany GPU mining is impossible (0 or minus income)
Even with these litecoin price these days?
i didnt checked it, but keep in mind that everytime the price rises more user came to the game so it is very likly that the difficulty had risen very high. So the profit-ratio should be the same like in the past.
My tip for you is, try first with one card + wattmeter, test out different pools (the winnings have huge differences!!)
and different coins (+ Multicoinpools).
Also see it as riskinvestment, it works only if your current costs equal or less than 0.20€ / 0.27$ per Kilowatt.
Also you should only by the best card with best best efficency.
When it doesnt work for you it is esier to sell 1 card on ebay, than a dozen :-).
i would also recommend than when you wnat to build a mining gpu rig, by a card where you can buy watercooling.
Watercooling is much more less noisy and you can direct the heat to another place if needed.
it costs 30% more, but it is it worth when you run more than one card.