Working on some pictures that I will publish later, but here is some news in the meantime.
Regarding Nvidia Geforce GTX 800 series.
"The Taiwanese partner manufacturer NVIDIA now states to SweClockers that it will be some time before Nvidia can introduce graphics processors with the architecture Maxwell 20 nanometers. At best, an occasional model will appear towards the end of the year, but more likely is that it will take until well into 2015. A shift from 28 to 20 nanometers is considered necessary for Nvidia to use Maxwell in the higher performance classes. This is especially true for the successors to the GK110, which is the basis for the Geforce GTX 780, GTX 780 Ti, Titanium and Titanium Black. The 20 nanometer delay may also explain why the first graphics card with architecture Maxwell does not present a new series, but now play along with generation Kepler in the existing 700 series."
So as we all suspected, Nvidia components are delayed. I think AMD kicked their as and Nvidia panicked and hence messed up launch dates etc. So, regarding the 6 GB versions of the 780 / 780 Ti, that is a direct response to AMD and the demand for higher memory capacity now. Someone did mention that the 6 GB version might be a disguise for delayed 800 series and who ever you are, here is your proof.
Meaning there is no reason for me to wait since the 780 Ti 6 GB will be the top of the line this year and I am only a few months away from getting the SLI.