My X-Dreamer II case.
Its excellent for air cooling. Very efficient. My temps while idle are as affective as the ambient temperatures (19-22*C).
I keep the cables nice and tidy.
My power supply came with a second LED fan (the blue/pink one) attached to it. I felt the PSU didnt need that much cooling, so I modded it and removed it. I now use it on the top blowhole of the system, exhausting hot air out the case.
One 80mm cold air intake on the side. Two 80mm exhaust. I've removed the fan guards on the side and the back to have maximum airflow. I plan on replacing the back 80mm exhaust with a nice 120mm (LED of course).
*edit*
I also plan on adding a cold-cathode in there as well.
I was also planning on doing water cooling, but, if you think about it, water cooling is only as effective as ambient temperatures as well, so it wouldnt do any difference in the way of cooling. Basicly I only want it because having UV reactant cooling in the system would just look so cool.