If your going to buy some hash power, I suggest mining at Kano.is. It is run by kano on the forums, and uses software developed by him and -ck (Mod on the forums). The lifetime luck of the pool is at 106% right now, so above expected.
Thanks so that means that is not worthy because if you extract mining fees from 0.00117781 btc daily its almost 75% fee in this moment meaning that daily profit for 1THS is only almost 30.000 satoshi. To buy 1THS now costs 0.08275 btc and ROI is a little bit long. I will wait for the S9 antminers to come in cause 75% fee of the S7 is not worth the investment. Thanks for the head ups.
The maximum accepted ROI period to me is 90 days. With difficulty increases would probably lead up to 120 days.
Everything above that is too risky and I would not accept it by buying shares or hashes.
If the maximum accepted ROI period for you is just 90 days and because of difficulty increases 120 days I think there's no legit cloud mining website with that ROI. For example since in this thread is being talked about Hashnest the ROI there is approximately 7 months or 210 days without taking in consideration the difficulty increase so with that in mind should go more days like 8-10 months.
With that kind of ROI you are asking only Topmine a really fast scamming cloud mining website was offering that. Its not possible with real cloud mining websites like Hashnest.