Hey Mota,
Have done some calculations on 30% on 2 of the best miners in the below thread.
https://bitcointalk.org/index.php?topic=327335.0At the moment it seems all miners will end up costing you money unless the bitcoin prices skyrocket even more from there current levels.
Cloud mining will cause greater losses.
Lets say you get 50GH/s at $20 - $1040 (with electical costs added)
At 30% difficulty increases and price staying the same you will lose half your money at current bitcoin prices.
I actually do feel sorry for people that have rushed into mining, I would say the best way to go if you feel bitcoin prices are going to increase is to hold BTC.