Steam Machien Form Factor Build

I am looking to build a mid grade gaming pc for myself. I want it the sise of a xbox one or ps4 so that I can put it in my backpack and take it to friends' houses for lanparties and hang outs. This is what I came up with and suggestions. I have a buget of $750. I know that I can get a better bag for my buck because of the up coming holiday season. 


I wouldn't feel comfortably sticking a 8320 on that motherboard.