Have you found out the cost of electricity for you where you are going to mine? If you can't buy cheap electricity for less than 5 cents and new ASIC models will be sold next year. But new ASIC models will be more profitable in terms of energy consumption, and after halving it may not be profitable for you to mine on old ASICs.
Basically we talk about $0.2, so we are far away from the $0.05 benchmark that you said. Guess I 'll have to wait...
Then you may be interested in this information, because you are better off buying cheaper ASICs, but you will have to deal with their firmware
https://bitcointalk.org/index.php?topic=5465088.msg62974759#msg62974759Chat with these ASIC firmware developers
https://vnish.netthey will offer you interesting overclocking for old modeo S19 ASICs. At $2,500, the S19k Pro is expensive.