We do not recommend any particular manufacturer. However there are few good pieces of advice based on best sector practices and experiences which we can give you:
- Be wary of suspiciously good rate of hash-rate/price and unknown companies.
- Think about the power consumption and power bills you have to pay.
- Later shipping date usually means lower than currently estimated profit because of the rising mining difficulty.
For ASIC miners comparison we recommend asicminervalue.com. There are dozens of devices listed with complete specifications and profit estimates. Do not forget to check for which algorithm is selected device made and which coins can be mined with it.