In order to raise the "K" multiplier, you will want a P67 or Z68 based motherboard. Most any will do.
If you have no need for a discrete gaming graphics card, and will use the integrated 2600K graphics, you will need the Z68.
The motherboard you linked will do fine.
A full ATX motherboard will have 7 expansion slots of various kinds.
A M-ATX motherboard will have 4, and a m-ITX will have only one.
Each will have at least one x16 pcie graphics slot.
For most of us, we do not need any extra slots since modern motherboards have already included functions such as sound or lan connections that previously were implemented with add on cards.
Also, for video editing, I suggest you get a 16gb(4 x 4gb) ram kit. Ram is cheap, and extra ram can be used to hold more data in ram for editing, lessening the performance hit of doing i/o to hard drives.