Goodmorning guys,I want to add 100 more TH to the pool and I am trying to find the best miners to buy,so I have 10 t9+ and 1 m3x,lets forget about the power comsumptions,the m3x is a beast and stable as hell,the t9+ is just cheap and 2 of them are mining at 8 to 9 Th instead of 10.5,I haven't tried yet the avalon 841 or the S9i,wtf should I buy?

Avalon miner 841 without psu 13TH             1120 USD
Pangolin miner  M3X with psu  12.5TH           850 USD
Antminer S9i with psu   14TH                         1010 USD
Antminer T9+ with psu   10.5TH                       635 USD