Best motherboard out of these five?

[albo23]

I'm build a mid-grade gaming PC and I already bought my i5-2500k processor. I narrowed down my motherboard search to five motherboard and I am hoping an expert in here can tell me which is the best

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131707
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128495
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128502
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128488
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128538

They are all about the same price so that isn't too much of a factor. I tried finding ones that have a second PCI-E port that is 8x instead of 4x.

The last one is a 16x/4x though, but it says "All PCI Express x16 slots conform to PCI Express 3.0 standard. To support PCI Express 3.0, you must install an Intel 22nm CPU." What does that mean, does it make it better than the rest?

 

[Rockdpm]

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131707

That one/ I pick that one. However, if you want ATX instead of Mirco ATX. they do have a ATX version of that exact board. But if your not gonna overclock too much the mATX will do fine. Even with 2 way SLI

 

[Suave145]

between these 2. If i took a bit more time i could pick but i like these 2.

ASUS P8P67-M PRO \
GIGABYTE GA-P67X-UD3-B3 \