Here's my rig. I've been wanting to actively cool my 4870 so I was pretty disappointed when my Xigmatech F2006 slim 200mm fan did not fit on the side panel next to my h70. As you can see from my pictures, I came up with a DIY solution. I'm very happy with the results; Furmark temps at 810 mHz core dropped from ~80/95/87 to ~70/80/74. It actually can run Crysis without crashing now
P.S. Those Ultra side fans that I used are LOUD! I ended up using one in-line resistor that came with the h70 behind the h70 fan splitter, and the other behind the side panel fan-splitter. The reason was because even at the lowest setting on the fan controller, the Ultras were too darn loud! I have to quickly crank up the side panel slider upon boot or else one of the fans won't start (always the same one for some reason) but then I can move it back down to the lowest setting and both fans will spin quietly.
P.P.S. Please look at the pictures of the top panel. Notice the slight curvature near the power button. Is this normal, or is my panel not sitting right? I checked and there seem to be no obstructions underneath. I only noticed it after installing the second top fan but it might have been there before as well.