Knc didnt shown any asic yet , there was only a demonstration of old fpga . BFL looks bether since they deliwered atliest asic mashines yet the waiting time for the product is horendes. If you want to mine assap than the block erupter usb or blade is your only option yet they r priced too high , so do not have high expectation on early profit. U can also buy an avalon asic miner but those r even more owerpriced becaus u can only buy one if some miner is willing to sell his own one.