might be a good idea to mine bitcoin or to buy some GPUs (whose price doesn't change so much during month) and start mining other cryptocurrencies ? that was my dillemma. Is there any other good producer except Antminer ?
https://canaan.io/shop/Canaan Creative.
Their newest miner is AvalonMiner 721.
You need AvalonMiner 721, controller (Raspberry Pi) and a power supply.