So after making a big mistake on last Black Friday, getting a gigantic ATX PSU, the HX1200i, I changed it to SF750.
It helped, when it came to cable management. Not sure if it can get any better. It probably can. Tinier cables really helped.
The only problem with changing to SF750, was that it didn't have enough PCIe connectors. I had to plug in 2x for CPU (8+4 pin to the motherboard), 2x for PCIe (for graphics card) and 1x for PEG on the motherboard. Since SF750 only has four CPU/PCIe connectors, I had to ditch the one for PEG.
Now, this computer didn't really need a power connection for PEG, as it doesn't have more than one graphics card. But still, it is a loss, in my opinion.
Anyway, this is the result..