You can buy a ITX motherboard with included wifi.
The antenna will attach to the back panel.
Here is one example:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157530
Video files are large, and not suitable for a ssd.
It might be best to include a storage hard drive.
The Q02 includes a psu, and space for two 2.5" drives(or one 3.5" drive)
The Q07 uses a atx psu and has room for both a 3.5" drive and a 2.5" drive.
Google to see some reviews of builds using these cases too see what is involved.
I have used both in several builds.
I am a bit dubious about the all in one. It is not clear to me what kind of storage is possible.
The antec isk 110 has a vesa mount, but would need 2.5" drives only.
2.5" hard drives are fine for...