I hope they release a mini-STX case, soon. IMO, that's the perfect format for an ARM-based microserver.
I have 4 Lian Li cases, but I don't plan on buying any of their peripherals. However, I would consider buying a few other accessories, such as headphone stand. As long as this doesn't distract from their case development, I don't care.
There's always some space for better peripherals. Last time I looked for a new kb/mouse, I ended up keeping what I had. This ( http://www.rapoo.com/product/119 ) is the closest one to what I wanted, but I was waiting for a deal, and forgot about it. And with Windows 10, bluetooth kb support is quite good, so I ended up switching to an older kb I had to put in the closet because it didn't play well with Win8, but that was in perfectly good condition.