I would have to say I had almost the same build as you before I upgraded. I used an obsidian 550D GREAT case imho. You might wanna check to see if your fans on the rad are working properly?
another thing that people often forget about is how their PSU is oriented. Bottom mount psu's can be flipped upside down so that they help exhaust air It will also help pull hot air away from your GPU's
Side note your psu is HUGE for your system. I only used a 650Watt I upgraded to an 850 when I upgraded my cpu to the 9590.
Only thing I can do is turn my window tray 120mm fans pulling air out instead of in, remove my hd trays I'm not using letting the fans push more air to the gpu's, and take the 8th fan that's attached to the tray installing it on the bottom of the case next to the psu pulling more air out of the case away from the gpu.
Love my setup, but in retrospect I would have went with a larger case with at least one 240mm fan