Most ITX builds don't end up being cable managed. I am of the opinion that the smaller your build, the more important cable management becomes. It's not always just for looks.
For me, the Cooler Master Elite 110 is, thus far, the best case for doing custom wires, without being too large. My build focuses on easy maintenance without being a pain to disassemble for cleaning. I can effectively take this build apart like field stripping a rifle, and put it back together clean.
This build has been a culmination of work I've done bit by bit when I have spare time. The first time I put this build together I had opted for a Haswell chip in 2014. I see no reason to upgrade this more than a year after, except for amping up a new GTX 970 from Zotac.
The issues people have talked about with the Zotac is non-existent, and it is a relatively quite card at 1080p+ gaming. Coil whine is not present when idle or at load with the parts used in this build. Wattage is almost exactly at 50%, optimal for most PSUs. It also happens to be the biggest and baddest card on the market that would fit inside this case at the time of building.
To the disgust of many, I am limited to a Maxwell card for now as this build is intended to be a hackintosh. It would be another year or so before Pascal cards shrink down to a mITX form factor and for Mac OS X to support it.
Why a hackintosh? well let just say it's much easier and more stable to run. I don't have to deal with stupid windows activation every time I have a hardware change. I also run a php apache server, and both are baked into Mac OS X natively. More over, all the plumbing on the software side seems to be more stable than Windows 7 or 10. I also happen to be a veteran Hackintosher since 2008.
Notes on the CoolerMaster 110 | External Cable management: Excellent.
The 110 is a great case, for those who will not shy away from doing custom wires. It is small and compact. Cable management was the main reason I bought this case. with most cables located at the bottom of the back of the case, I can route cables under my desk easily. I essentially have one 1.8m umbilical running from my 110 to my monitor. The rest of the cables are neatly tucked away underneath the front edge of the table. Most case place the PSU at the bottom, with the motherboard on top; this means the data cables are clearly visible. I had to replace the OEM power cable with a angled cable to match same the direction of my umbilical cable.
Notes on the CoolerMaster 110: Internal Cable management: Perfect custom wire case, OEM ATX cables are difficult to tuck away.
The modular ATX ports of my PSU are located centrally above the motherboard. The good news is any cables you cut will not need a lot of length, the bad news is the more cables you fit on, the more work you need to do to cut the wires to size. This is because there are almost no spaces to tuck OEM cables except in the corner next to my GPU and in the space in the front panel. I had planned this build to be a custom wire build, so I was prepared for putting the hard work in to get it looking spick and span. Sleeving cables could take up more space with a minor obstruction to air flow, but I am willing to sacrifice that for the looks inside the case.
The case is also designed for liquid CPU cooling. The OEM pictures recommend a closed loop cooler's tubes to be placed facing the side of the case. I found that having them facing down and below the PSU to be the best position. That way the liquid conduits don't get in the way of the custom cables down to the motherboard.
Hard Drives and SSDs are placed all around the walls of the case, making them easily hot swappable. This cannot be said for other mITX cases. It still suffers from the separation of power and data SATA cables. As much as possible, I've mitigated this cable mess with SATA drive as much as I could by selecting custom length rounded SATA Cables, and custom ATX power connections.
I am very happy with this build, and the fact that I can field strip it, clean it and put it back together was the reason I stopped using real Macs, and switched to a Mac Mini, then from a Mac Mini to a Hackintosh.
For those of you who dislike dust inside the case and want a practical build, the Cooler Master 110 is a must.