wow, that case is even worse for cable tidying than my elite 342. i do have some ideas though:
- bunch up the two PCIe cables going towards the graphics card in an oval so they go in a straight line from the PSU to the PCIe slot
- use the space between the PSU and the side of the case to shove loads of cables in if you can and cable tie these to some part of the case so they wont move about
- tape the leads that go from the front panel to the motherboard at the bottom of the case (the bottom of it in the picture anyway)
- if they will fit, route the rear fan power cables between the fan casing and the motherboard back panel, then between the graphics card and motherboard, then round the edges of the case, cable tying or taping to the case wherever is convenient
- if it will reach, try and get the CPU power cable to go around the RAM, rather than over it (underneath the power connector for the hard drive thats beneath the DVD drive would be great)
i assume that since the PSU is modular you've removed all unused cables
if all else fails, just use string, LOADS of string