Do you really need a M-Itx mobo? Can't you go with a M-Atx board?
As for cases, Silverstone makes really good small form factor cases, such as the FT03 , and now they have a smaller version of it that can only accept M-Itx boards, the FT03-Mini.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.