To big a gamble to stake way over $12k on. Good luck though, I admire your balls, and I thought I was risky putting $900 into 3 x BFL 5 g/h miners (15G/H) to arrive this side of Xmas.
I've calculated I will make back the BTC spent on this outlay within the next 120 days, even accounting for difficulty increases (And to be clear, am reinvesting previously mined BTC accrued over the last couple years)
Am OK with that.
I've tried to run the numbers but the very best case scenario I've calculated for your setup is break even in aprox. 200 days, and that with a ridiculously optimistic 0.5 yearly profitability decline (which means that in the next 12 months difficulty would only double, and we know that won't happen).
Could you share your numbers, Xian? I'm very curious about them.