I can suggest you a very good professional mining equipment - rent antminer s9
https://minery.io/hardware-store/antminer-s9/ . This is an ideal option for bitcoin mining. The miner is powerful, energy efficient, has many advantages and disadvantages. Among the various models, rent antminer s9 is considered the most popular. It really lives up to its value. I have attached a link above for you with a store where you can purchase equipment at a good price.
