250D and the H100I GTX
"newer model h100 gtx you will have trouble with."
I had no trouble. The MB I used was a Gigabyte GA-Z97N-Gaming 5, the processor is a 4790K. The rest, I think you can figure out. The way to install it is remove the bottom bracket that the radiator screws on to and replace it as the very last thing you do on your build. You can reinstall the bracket without dismounting the radiator. Don't get me wrong, it's a perfectly tight fit but it's actually easy to get it in there (and out if you have to). I can also fit the optical drive tray in if I want to.
I could not mount the radiator fans on the other side of the radiator even if I wanted to because it would cause a clearance issue with the bottom hose but the way I have it is recommended anyway.
The Gigabyte MB is solid and build very well. The bios firmware is stable and good but the interface is not as good as I would like but I am not much of a tweaker in my old age so the way it is setup is the way it will probably remain. I know, my GPU is old but I laugh to myself when I think about people spending $600+ on a video card and tweak out on an $80 case. I want more computer for my $$ and something that will last 5 years or so.
You should not think about using slim fans unless they are 4 pin (PWM) the cooler and fans should be controlled by either the MB or the Corsair link software and 3 pin fans won't cut it. Also, the fans included are designed to provide enough air pressure through the radiator to be effective. I cannot find a PWM fan with LED lights. I don't think they exist. The Corsair fans are quiet enough in quiet mode.
I also flipped the fans around after taking these images so air is pulled in to the case rather than pushed out. All air is pulled in and only exhausts out the 2 80mm ports in the back and the drive bay at the back. I need to make sure dust and cat hair stays out of my case. I also live in a Hawaiian rainforest 1 mile from the beach so I was glad when liquid cooling solutions became easy. Often times, it's 93 degrees in my office with 70-80% humidity.
I wish they gave us magnet filters for all of the vents in the case.
Edit: I would like to add that the EVGA SuperNOVA 650 G1 80+ GOLD, 650W Continuous Power, Fully Modular is also awesome. I used to cringe every time I would reboot for windows but now the PSU doesn't do the entire power down and power up when rebooting which will prolong the life of the system. The cables and everything EVGA adds to their products is just top notch. The last time I had to RMA power supplies, it cost me $40 in shipping and I wanted to go postal.
Aloha!Edited by Shrinker - 10/29/15 at 6:04pm