Wow very nice.
Is it just me or do you have only one fan on your radiator?
Just out of curiosity, how much space is there between the top of the graphics cards and the side panel of the case? I'm wondering whether it's possible to install another radiator between the side panel and the graphics cards and then just make a hole in the side panel for ventilation. This would allow you to have a dedicated radiator just for your GPU('s).