You don't need to go socket 2011 for those needs. I would personally get a 4770k + beast of a mobo + 280x gigabyte to crossfire with that 7970 and you save 57 £ vs 4930k + rampage iV
Thanks for the idea, but like said, I have made my mind on the 4930k. And on the crossfire part, I had 2 HD6950s in CFX and they didn't work that great, had lot of minor problems with them and some bigger issues too.
I'd like to think that these parts would last maybe around ~3-4 years in use ( unless there's a part failure, like the case is now and forces me to upgrade bit earlier than I thought I'd have to ) and upgrade after that then again.