For me ideal water cooling case would be very similar to TJ07. What is good and already exist:

- optional inverted atx
- removable motherboard tray
- compartment style section for radiator + perfect fit for 480 rad + 240/360, more than enough for high end sli, all hidden
- possible window on top

What should be fixed/updated

- black interior out of box for black version
- different position of window, slightly smaller (not show 5,25 bays)
- available windowed side panel for inverted atx version
- cable management holes out of box (these few crucial ones everyone mods)
- clean window on top, preferably glass not plexi, same goes for side panel
- different finish of main part of the case (entire front panel) - burshed aluminium all the way, that is exact match to cd bezels
- high quality aluminium power button, not plastic
- stock radiator mounts (that place radiator precisely at the center of rad compartment, just like murdermod hammond boxes)
- clean solid backplate, without any vent holes
- clean solid midplate, with just two fitting holes to route tubing, ready for real fittings (not rubber grommets like in most of cases)
- could have one extra expansion slot for larger motherboards and more video cards

With these minor changes this case would be close to perfect. It is important for the case, to be able to present water cooling rig as well as possible, at least im my opinion. Top panel window makes huge difference here, and this is the reason why I dislike cases with radiator on top. Motherboard is clutched somewhere between radiator (top) and powersupply (bottom), usually it leads to awkward window shape, or window that shows too much. As for the radiator surface, 480+240 is more than enough, unless we are going crazy for more than two gpus and multiple cpu, then we probably want one of these gigantic (but ugly) cases. Average user will never need more space for radiators, so that area is competely covered by Tj07. And again, no need for vertical motherboard orientation style (tj11), for a couple of reasons. First - we don't need that extra cooling cause it is wc, there will be no single fan in motherboard compartment. Second - window on top isn't possible - same problem as radiator on top. There is no point to improve certain things if they are already very good.