When I built my 4670k rig there was only a couple of matx boards available.
I wound up getting this one. http://www.newegg.com/Product/Product.aspx?Item=N82E16813128599
No regrets. OC's fine.
You won't need anything too fancy to overclock a haswell k chip.
Compare features to see what you need/want. Things like SLI support are a must for some people, others like Intel LAN's, etc.
I will not SLI. Intel LAN is very important.
On another forum the Asus Maximus gene IV is getting a lot of praise followed by the Asrock OC Z87M formula.
A board that covers all the bases and like OC, built in sound and so on......
Intel LAN is very important.