Hi guys,

no I'm not another newbie whos thinking to get rich by mining.
I know that mining is not profitable at all due to rising difficulty caused by "mining-noobs", losing a lot of their money.

In fact I think theres acutally blowing up some kind of mining bubble. When people realise they make no profit and sell all there mining hardware the bubble could explode and rise the btc prise down. But thats just a theory.

I'm writing a bachelor thesis about bitcoin and in one chapter I will analyze if its possible to make a profit by mining.
Also I want to calculate how much it costs to mine one singe BTC (power costs + proportional hardwarecostes). Therefore I will make the assumption that only the most efficient (hash per watt) mining hardware is used.

So what is the most efficient hardware available at the moment? It's important that it has been already delivered to some people. I don't want to calculate with one of those preorder hardware minng, which may never arrive. 

Thanks for helping me out.