As for recommendation on motherboard, I would go with the ASUS P7P55D-E Pro. As for the PCIe x4 slot, it is not required for any system. It is only needed if you plan to use a device that utilizes that slot.
I guess that was my question...what kind of devices require a x4 slot
I am trying to determine if I will need a x4 slot in the future, but if I don't know what kind of devices require that slot, I can't decide if I will need it or not.
Yes, the P7P55D-E Pro looks great but is a bit on the expensive side. I was looking for something a little less expensive (around $130...I live in Canada) but of good quality, ideally from ASUS or Gigabyte.