The S7 is a power beast, agreed. I have the S7-LN, this only runs at 2.7Th but has a much lower power and is very efficient, this I can see though will not be running at profit in a few months time. And I also agree, that the R4 is the one to buy, but not if it's £1000! It would be impossible to pay off if the price is over £500, or approx 1.2BC. If it goes up for 1BC, then I'll be ordering it straight away.