I like that Diff level is rocketing. I pay average 0.05€/kwh and all mine miners is used for space heating without option to use heatpumps so I can do profit even Diff level is 1000... Btw. Actually there is no even limit for that. It will be it in 2017. What comes to Bitcoin price, this around 300-400€/btc is good level I hope it going to be this level for years that price changes going to more stable.

Estimated next level is over 170

Difficulty Rise Acceleration. How long? 5-20% jump for every check point until sun will fade away.