This may seem quite obvious to some, but I can't work it out from your figures at all...
For the smallest package what is the expected BTC return per day?
Right now according to BitcoinWisdom dot com - the 2.850 THash would yield 0.05226
BTC /Day at current difficulty. Halve that for the 1.425 = 0.02613 / Day @ current difficulty.
Best,
Strato