I bought a fanless mini pc from CappuccinoPC. I don't see the exact model I purchased on their site, but it was close to this one:
1.65"H x 5.75"W x 9.84"D
Slightly bigger than the mini-mac, and not as stylish.
They have a variety of other systems, some with fans, some without. Some of them come in a brushed silver color.
They have cases, barebones, and fully functional offerings. I bought a complete PC and it was under $600.