I have a H81M-K mobo (it's MATX) and I'm unsure if Micro ATX cubes are best for it.
this for example: https://www.newegg.com/Product/Product.aspx?Item=N82E16811133274&ignorebbr=1
this for example: https://www.newegg.com/Product/Product.aspx?Item=N82E16811133274&ignorebbr=1