Finding a motherboard that supports 4 way sli + other things?

First let me say this, i am giant scrub when it comes to this stuff, i dont know much. I am like noob central. So please dont be harsh.

So, i have a gtx 780, and im that kind of guy that wants to max all settings out, but this single card sometimes doesnt let me do so and still have a solid 60 fps. That is why i want to one day go 2 way sli, maybe even 3 way. (i know 3 way isnt that much of an increase, thats why i said some day)

now, i am more than likely, never, EVER, going 4 way, but i still want a motherboard that supports 4 way. Rather have it and not need it, then need it and not have it, you know?

this is where my nooby-ness comes in. I dont know anything....

first off, all motherboards that have 4 slots look that same, but the last on is really close to the edge. Since 780 is a 2 slot card, wont it go over the connections and not allow them to be plugged in?



Secondly, i currenly have on my pc an ethernet cable card, which is in the pci express 3.0 slot



I dont know if its my eyes, but the slot looks a little raised compared to the rest, does this affect inserting any gpus? And also, i need my internet, but all the motherboards i have looked at only have 1 of these, are near the top, and will be blocked by a card if using sli...

along with this, i have a wifi card that is connected to a pcix1, which i would like to also plug in? but isnt necessary. I read that they work in the gpu slots, but when i did so on my motherboard, i just got blue screen..so if you guys could clarify this bit for me?

So that is really about it. Remember, im a noob, so i dont know if what im asking for is even possible.. 4 way sli capability, and being able to connect my ethernet and wifi card?

Please explain why either im too much of a noob to understand why something cant be so, or point me to some motherboards?

Any help would be GREATLY appreciated!

Sorry for writing so much, but in reviewing, i just read something about socket types! cpus vary in sizes or something? so some motherboards wouldnt work? is this the same for ram and things?

my current motherboard is the gigabyte x79-up4
i think the type is a lg 2011? but i need clarification because i dont want to mess up. So that means that my processor size type thing? and i can only get motherboards that are lg 2011?

the only motherboard i have been able to find is this very expensive one:
ASRock X79 Extreme11 LGA 2011 Intel X79 SATA 6Gb/s USB 3.0 Extended ATX Intel Motherboard

all the slots are interchangeable right? gpu cards fit in each? ethernet card can fit anywhere? or?