If you want to get video off the iGPU on that processor, then the Z77 platform. If you have no need for the iGPU(which often helps when troubleshooting a discrete GPU issue) then you can get the Z68 chipset board.
Edit:
My brain read P67 in spite of my eyes seeing Z68. Either one will get the job done. If you intend to drop in a 3rd Gen Intel processor later down the road then perhaps look into the Z77 platform but essentially they are the same.