basically, all I can seem to buy right now that will deliver in feb is maybe 100-200gh/s miners.... and the thing is, from what I have read, If I pre-order some 2th/s device from cointerra or where ever, I will pretty much have to wait till MAY or later, and everybody says by then the difficulty will be so high that 2th/s will be the equivalent of 200gh/s today.... is that correct?