Looks pretty good, that is a nice system you have there sir.
I do have a concern, all those wires. they are actually probably adding a solid 4-5c to your temps. because they are killing your airflow. the Antec 900 is a decent case with some great airflow. all those fans in there. and mainly the two 120mm front fans, and the top 200mm fan. but ALL those wires bundled in the front upper middle area is stopping almost all the airflow from front to back. I'm pretty sure you'd see temp decreases with some cable management.
I'm not sure how long you've had the Antec 900, but if you've bought it in the last 6 months. they came out with a revision where they cut some holes in the motherboard tray for cable management. What I've learned helps the most. is to try and seperate all the wires. I actually took them through to the backside of the mobo tray. and I have them going from bottom to top on the back side. and don't overlap any or the sidepanel will not fit back on. but you should be able to hide most of those. and is that a HD sitting sideways I see in one of those pictures.??
see something like this will help airflow and temps. I have more wires than you.. all hidden. most are behind the motherboard tray between it and the sidepanel.
I also have a picture before water-cooling, in my old case that is comparable to the antec 900.. it's a bad picture. but this is how my back panel looked. and the side actually still fits on when you do this.
good luck. this would help ur temps. (But don't bundle the main PSU wires like the 24 pin, 8 pin and PCI-E 6 pins all together like I did. as that part I had to redo to get the panel to go on.. so don't do that)