Right, I think I'll expand the thread to both mini and micro. I do not mind selling my mobo and getting a smaller oneUnfortunately, you did not check specs of the Ghost S1:
* MOTHERBOARD: Mini-ITX
For MATX, I'd suggest looking into Project Orthrus.
That settles it thenIf you can go smaller, I agree the Ghost S1 is a good choice at around 7-8 liters. I've seen AIO fitment testing on the project thread, as well as full-blown custom liquid cooling too. It's really amazing for the size, just not the price.