If you're going to be doing a custom loop for CPU and GPU, then really the only things that matter towards cool & quiet are:
- case's compatibility with liquid cooling components, especially the amount of radiator space available
- what liquid cooling component's you will be using and what fans you will be using
I'm not sure you'll be able to achieve good results with liquid cooling in any of those cases (without extensive modding), since they all have very limited radiator space. ideally, you would want 240mm of radiator for the GPU, and at least 120mm for the CPU (but 240mm wouldn't hurt either as the 4790K isn't a cool running CPU, unless delidded).
UMX1 - 1 x 120 mm top, 1 x 80 mm rear. Nope, forget about it.
UMX3 - 1 x 140 mm top, 1 x 120 mm rear. A bit better - but since they are so close to each other, I highly doubt you'll be able to fit radiators+fans in both without overlap unless the rear radiator is mounted externally which requires modding
InWin 901 - According to specs, supports one 120mm radiator at the back, but not at the bottom 120mm slot. That won't do either.
Phanteks Enthoo Evolv ITX would have plenty more space for radiators (e.g. 240mm front, 240mm top), but it's not quite so compact.
Maybe you should go with air cooling? Pick a quiet HSF for the CPU and mod your graphics card with a third party cooler. There are some AIO liquid mods for graphics cards that might work.