Just moved into a new flat and electricity's free for a few weeks so I'm running ccminer on a Gigabyte GTX 770 OC which yields a measly 0.25khs. Also using the spare CPU cycles on a dedicated box in a datacentre with minerd which adds another 0.15khs. In total, this could actually cover the cost of the dedibox at the end of the month, not that bad when you think about it.