You mention the I7-3770k. It's a Socket 1055 CPU.
The boards that you list are all X79 ones (Socket 2011). Completely incompatible with the above.
With the boards that you list, you have 3 basic CPU choices: the I7-3820 (quad core), the I7-3930k (6 core, unlocked), and the I7-3960X (6 core, unlocked, "extreme" CPU, extremely priced at approx. $1k US.)
There are also Socket 2011 Xeons, with as many as 8 cores, but they're intended for server boards. (The Asus P9X79 WS supports them, though.) I know nothing about unlocked multipliers on Xeons, but it seems unlikely.
As regards SLI, I'm not sure whether nVidia's drivers
would support more than two 690 cards, regardless of how many PCI-E X16 slots the motherboard has. (Quad SLI" is two 690s (4 GPUs). 8X SLI (four 690s) would be impressive (and expensive), but AFAIK, it's not permitted.