Hello guys I am a newbie with this mining hardware.

I understand well and i have done some research about the actual mining. So the difficulity rate goes up.
Now I am looking to buy the new terraminer IV with its 2000 GH/s. I am thinking of buying 2 at once
that will be somewhere around 10k. Will it take long to get ur ROI? Can someone help me out because I
searched alot and made some calculations and with the current bitcoinrate I should be able to get my investment
back in somewhere around a month or maybe 2. Somebody have some decent advise for me?

I thank everybody sincerly for helping me out!