I7 wouldn't help you in WoW. Only will help you for specific programs that would use hyperthreading.
Friendship is like peeing on yourself, everyone can see it, but only you get to feel the warmth it brings.
@dekb97
One reason to keep your build questions to one thread (besides what the mods told you) is that it makes it a lot easier to follow what's going on, what was already discussed, current components etc.
Seems you need a motherboard to go with the rest of the stuff you picked out already. I'm just gonna mention again for gaming there is little to no reason for you to go with the i7-4770k over the i5-4670k.
I'm not gonna look for second hand parts for you but I can suggest some motherboards based on danish prices/features and you can then look for those on your own, sounds good?
Listed by price:
ASRock Z87 Extreme3
MSI Z87-G43 GAMING (no SLI support)
MSI Z87-G55
ASUS Z87-A
MSI Z87-G45 GAMING
There are cheaper and more expensive board but I feel these gives a decent amount of features, support and quality with the priced considered. So see what what you can get, maybe you like the looks/software/fan controls etc. over another one.