Bitcoin is down 189 today, shall I try to buy the miner?
To become a miner is a decision to make that should not be affected by the fluctuating price of bitcoins. One btc still remains One btc, and that is what you should be your overall motivation. If you plan to buy a miner, go ahead and do so, btc will not continue to decline even if the situation currently looks as though there is no end. I believe that if you have an interest in mining and you have settled and put under control the other factors necessary for successful mining, go ahead without consideration of the decline.